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This list reflects the Geographical Names Index found on the Foreign, Commonwealth and Development Office (FCDO) website, excluding the last column in that Index ("Citizen names"). 

Cod gwlad (Country code) Enw yn Saesneg (Name in English) Enw yn Gymraeg (Name in Welsh) Enw swyddogol yn Saesneg (Official name in English) Enw swyddogol yn Gymraeg (Official name in Welsh)
AF Afghanistan Affganistan The Islamic Republic of Afghanistan Gweriniaeth Islamaidd Affganistan
AL Albania Albania The Republic of Albania Gweriniaeth Albania
DZ Algeria Algeria The People's Democratic Republic of Algeria Gweriniaeth Ddemocrataidd Pobl Algeria
AD Andorra Andorra The Principality of Andorra Tywysogaeth Andorra
AO Angola Angola The Republic of Angola Gweriniaeth Angola
AG Antigua and Barbuda Antigua a Barbuda Antigua and Barbuda Antigua a Barbuda
AR Argentina Yr Ariannin The Argentine Republic Gweriniaeth yr Ariannin
AM Armenia Armenia The Republic of Armenia Gweriniaeth Armenia
AU Australia Awstralia The Commonwealth of Australia Cymanwlad Awstralia
AT Austria Awstria The Republic of Austria Gweriniaeth Awstria
AZ Azerbaijan Azerbaijan The Republic of Azerbaijan Gweriniaeth Azerbaijan
BH Bahrain Bahrain The Kingdom of Bahrain Teyrnas Bahrain
BD Bangladesh Bangladesh The People's Republic of Bangladesh Gweriniaeth Pobl Bangladesh
BB Barbados Barbados Barbados Barbados
BY Belarus Belarws The Republic of Belarus Gweriniaeth Belarws
BE Belgium Gwlad Belg The Kingdom of Belgium Teyrnas Gwlad Belg
BZ Belize Belize Belize Belize
BJ Benin Benin The Republic of Benin Gweriniaeth Benin
BT Bhutan Bhutan The Kingdom of Bhutan Teyrnas Bhutan
BO Bolivia Bolivia The Plurinational State of Bolivia Gwladwriaeth Amlgenedl Bolivia
BA Bosnia and Herzegovina Bosnia a Herzegovina Bosnia and Herzegovina Bosnia a Herzegovina
BW Botswana Botswana The Republic of Botswana Gweriniaeth Botswana
BR Brazil Brasil The Federative Republic of Brazil Gweriniaeth Ffederal Brasil
BN Brunei Brunei Brunei Darussalam Brunei Darussalam
BG Bulgaria Bwlgaria The Republic of Bulgaria Gweriniaeth Bwlgaria
BF Burkina Faso Burkina Faso Burkina Faso Burkina Faso
BI Burundi Burundi The Republic of Burundi Gweriniaeth Burundi
KH Cambodia Cambodia The Kingdom of Cambodia Teyrnas Cambodia
CM Cameroon Cameroon The Republic of Cameroon Gweriniaeth Cameroon
CA Canada Canada Canada Canada
CV Cape Verde Cape Verde The Republic of Cabo Verde Gweriniaeth Cabo Verde
CF Central African Republic Gweriniaeth Canolbarth Affrica The Central African Republic Gweriniaeth Canolbarth Affrica
TD Chad Chad The Republic of Chad Gweriniaeth Chad
CL Chile Chile The Republic of Chile Gweriniaeth Chile
CN China Tsieina The People's Republic of China Gweriniaeth Pobl Tsieina
CO Colombia Colombia The Republic of Colombia Gweriniaeth Colombia 
KM Comoros Comoros The Union of the Comoros Undeb y Comoros
CG Congo Congo The Republic of the Congo Gweriniaeth Congo
CD Congo (Democratic Republic) Congo (Gweriniaeth Ddemocrataidd) The Democratic Republic of the Congo Gweriniaeth Ddemocrataidd Congo
CR Costa Rica Costa Rica The Republic of Costa Rica Gweriniaeth Costa Rica
HR Croatia Croatia The Republic of Croatia Gweriniaeth Croatia
CU Cuba Ciwba The Republic of Cuba Gweriniaeth Ciwba
CY Cyprus Cyprus The Republic of Cyprus Gweriniaeth Cyprus
CZ Czechia Tsiecia The Czech Republic Y Weriniaeth Tsiec
DK Denmark Denmarc The Kingdom of Denmark Teyrnas Denmarc
DJ Djibouti Djibouti The Republic of Djibouti Gweriniaeth Djibouti
DM Dominica Dominica The Commonwealth of Dominica Cymanwlad Dominica
DO Dominican Republic Gweriniaeth Dominica The Dominican Republic Gweriniaeth Dominica
TL East Timor Dwyrain Timor The Democratic Republic of Timor-Leste Gweriniaeth Ddemocrataidd Timor-Leste
EC Ecuador Ecuador  The Republic of Ecuador Gweriniaeth Ecuador
EG Egypt Yr Aifft The Arab Republic of Egypt Gweriniaeth Arabaidd yr Aifft
SV El Salvador El Salvador  The Republic of El Salvador Gweriniaeth El Salvador
GQ Equatorial Guinea Guinea Gyhydeddol The Republic of Equatorial Guinea Gweriniaeth Guinea Gyhydeddol
ER Eritrea Eritrea The State of Eritrea Gwladwriaeth Eritrea
EE Estonia Estonia The Republic of Estonia Gweriniaeth Estonia
SZ Eswatini Eswatini Kingdom of Eswatini Teyrnas Eswatini
ET Ethiopia Ethiopia The Federal Democratic Republic of Ethiopia Gweriniaeth Ddemocrataidd Ffederal Ethiopia
FJ Fiji Ffiji The Republic of Fiji Gweriniaeth Ffiji
FI Finland Y Ffindir The Republic of Finland Gweriniaeth y Ffindir
FR France Ffrainc The French Republic Gweriniaeth Ffrainc
GA Gabon Gabon The Gabonese Republic Gweriniaeth Gabon
GE Georgia Georgia Georgia Georgia
DE Germany Yr Almaen The Federal Republic of Germany Gweriniaeth Ffederal yr Almaen
GH Ghana Ghana The Republic of Ghana Gweriniaeth Ghana
GR Greece Gwlad Groeg The Hellenic Republic Y Weriniaeth Helenaidd
GD Grenada Grenada Grenada Grenada
GT Guatemala Guatemala The Republic of Guatemala Gweriniaeth Guatemala
GN Guinea Guinea The Republic of Guinea Gweriniaeth Guinea  
GW Guinea-Bissau Guinea-Bissau The Republic of Guinea-Bissau Gweriniaeth Guinea-Bissau
GY Guyana Guyana The Co-operative Republic of Guyana Gweriniaeth Gydweithredol Guyana
HT Haiti Haiti The Republic of Haiti Gweriniaeth Haiti
HN Honduras Honduras  The Republic of Honduras Gweriniaeth Honduras
HU Hungary Hwngari Hungary Hwngari
IS Iceland Gwlad yr Iâ Iceland Gwlad yr Iâ
IN India India The Republic of India Gweriniaeth India
ID Indonesia Indonesia The Republic of Indonesia Gweriniaeth Indonesia
IR Iran Iran The Islamic Republic of Iran Gweriniaeth Islamaidd Iran
IQ Iraq Irac The Republic of Iraq Gweriniaeth Irac
IE Ireland Iwerddon Ireland Iwerddon
IL Israel Israel The State of Israel Gwladwriaeth Israel
IT Italy Yr Eidal The Italian Republic Gweriniaeth yr Eidal
CI Ivory Coast Y Traeth Ifori The Republic of Côte D’Ivoire Gweriniaeth Côte D’Ivoire
JM Jamaica Jamaica Jamaica Jamaica
JP Japan Japan Japan Japan
JO Jordan Gwlad yr Iorddonen The Hashemite Kingdom of Jordan Teyrnas Hashimaidd Gwlad yr Iorddonen
KZ Kazakhstan Kazakhstan The Republic of Kazakhstan Gweriniaeth Kazakhstan
KE Kenya Kenya The Republic of Kenya Gweriniaeth Kenya
KI Kiribati Kiribati The Republic of Kiribati Gweriniaeth Kiribati
XK Kosovo Kosovo The Republic of Kosovo Gweriniaeth Kosovo
KW Kuwait Kuwait The State of Kuwait Gwladwriaeth Kuwait
KG Kyrgyzstan Kyrgyzstan The Kyrgyz Republic Gweriniaeth Kyrgyzstan
LA Laos Laos The Lao People's Democratic Republic Gweriniaeth Ddemocrataidd y Bobl Lao
LV Latvia Latfia The Republic of Latvia Gweriniaeth Latfia
LB Lebanon Libanus The Lebanese Republic Gweriniaeth Libanus
LS Lesotho Lesotho The Kingdom of Lesotho Teyrnas Lesotho
LR Liberia Liberia The Republic of Liberia Gweriniaeth Liberia
LY Libya Libya Libya Libya
LI Liechtenstein Liechtenstein The Principality of Liechtenstein Tywysogaeth Liechtenstein
LT Lithuania Lithwania The Republic of Lithuania Gweriniaeth Lithwania
LU Luxembourg Lwcsembwrg The Grand Duchy of Luxembourg Archddugiaeth Lwcsembwrg
MG Madagascar Madagascar  The Republic of Madagascar Gweriniaeth Madagascar
MW Malawi Malawi The Republic of Malawi Gweriniaeth Malawi
MY Malaysia Malaysia Malaysia Malaysia
MV Maldives Maldives The Republic of Maldives Gweriniaeth Maldives
ML Mali Mali The Republic of Mali Gweriniaeth Mali
MT Malta Malta The Republic of Malta Gweriniaeth Malta
MH Marshall Islands Ynysoedd Marshall The Republic of the Marshall Islands Gweriniaeth Ynysoedd Marshall
MR Mauritania Mauritania The Islamic Republic of Mauritania Gweriniaeth Islamaidd Mauritania
MU Mauritius Mauritius The Republic of Mauritius Gweriniaeth Mauritius
MX Mexico Mecsico The United Mexican States Unol Daleithiau Mecsico
FM Micronesia Micronesia The Federated States of Micronesia Gwladwriaethau Ffedereiddiedig Micronesia
MD Moldova Moldofa The Republic of Moldova Gweriniaeth Moldofa
MC Monaco Monaco The Principality of Monaco Tywysogaeth Monaco
MN Mongolia Mongolia Mongolia Mongolia
ME Montenegro Montenegro Montenegro Montenegro
MA Morocco Morocco The Kingdom of Morocco Teyrnas Morocco
MZ Mozambique Mozambique The Republic of Mozambique Gweriniaeth Mozambique
MM Myanmar (Burma) Myanmar (Burma) The Republic of the Union of Myanmar Gweriniaeth Undeb Myanmar
NA Namibia Namibia The Republic of Namibia Gweriniaeth Namibia
NR Nauru Nauru The Republic of Nauru Gweriniaeth Nauru
NP Nepal Nepal Nepal Nepal
NL Netherlands Yr Iseldiroedd The Kingdom of the Netherlands Teyrnas yr Iseldiroedd
NZ New Zealand Seland Newydd New Zealand Seland Newydd
NI Nicaragua Nicaragua The Republic of Nicaragua Gweriniaeth Nicaragua
NE Niger Niger The Republic of Niger Gweriniaeth Niger
NG Nigeria Nigeria The Federal Republic of Nigeria Gweriniaeth Ffederal Nigeria
KP North Korea Gogledd Korea The Democratic People's Republic of Korea Gweriniaeth Ddemocrataidd y Bobl Korea
MK North Macedonia Gogledd Macedonia Republic of North Macedonia Gweriniaeth Gogledd Macedonia
NO Norway Norwy The Kingdom of Norway Teyrnas Norwy
OM Oman Oman The Sultanate of Oman Swltaniaeth Oman
PK Pakistan Pacistan The Islamic Republic of Pakistan Gweriniaeth Islamaidd Pacistan
PW Palau Palau The Republic of Palau Gweriniaeth Palau
PA Panama Panama The Republic of Panama Gwerinaeth Panama
PG Papua New Guinea Papua Guinea Newydd The Independent State of Papua New Guinea Gwladwriaeth Annibynnol Papua Guinea Newydd
PY Paraguay Paraguay The Republic of Paraguay Gweriniaeth Paraguay
PE Peru Periw The Republic of Peru Gweriniaeth Periw
PH Philippines Ynysoedd Philippines The Republic of the Philippines Gweriniaeth y Philippines
PL Poland Gwlad Pwyl The Republic of Poland Gweriniaeth Gwlad Pwyl
PT Portugal Portiwgal The Portuguese Republic Gweriniaeth Portiwgal
QA Qatar Qatar The State of Qatar Gwladwriaeth Qatar
RO Romania Rwmania Romania Rwmania
RU Russia Rwsia The Russian Federation Ffederasiwn Rwsia
RW Rwanda Rwanda The Republic of Rwanda Gweriniaeth Rwanda
WS Samoa Samoa The Independent State of Samoa Gwladwriaeth Annibynnol Samoa
SM San Marino San Marino The Republic of San Marino Gweriniaeth San Marino
ST Sao Tome and Principe Sao Tome a Principe The Democratic Republic of Sao Tome and Principe Gweriniaeth Ddemocrataidd Sao Tome a Principe
SA Saudi Arabia Saudi Arabia The Kingdom of Saudi Arabia Teyrnas Saudi Arabia
SN Senegal Senegal The Republic of Senegal Gweriniaeth Senegal
RS Serbia Serbia The Republic of Serbia Gweriniaeth Serbia
SC Seychelles Seychelles The Republic of Seychelles Gweriniaeth Seychelles
SL Sierra Leone Sierra Leone The Republic of Sierra Leone Gweriniaeth Sierra Leone
SG Singapore Singapore The Republic of Singapore Gweriniaeth Singapore
SK Slovakia Slofacia The Slovak Republic Y Weriniaeth Slofac
SI Slovenia Slofenia The Republic of Slovenia Gweriniaeth Slofenia
SB Solomon Islands Ynysoedd Solomon Solomon Islands Ynysoedd Solomon
SO Somalia Somalia Federal Republic of Somalia Gweriniaeth Ffederal Somalia
ZA South Africa De Affrica The Republic of South Africa Gweriniaeth De Affrica
KR South Korea De Korea The Republic of Korea Gweriniaeth Korea
SS South Sudan De Sudan The Republic of South Sudan Gweriniaeth De Sudan
ES Spain Sbaen The Kingdom of Spain Teyrnas Sbaen
LK Sri Lanka Sri Lanka The Democratic Socialist Republic of Sri Lanka Gweriniaeth Sosialaidd Ddemocrataidd Sri Lanka
KN St Kitts and Nevis St Kitts a Nevis The Federation of Saint Christopher and Nevis Ffederasiwn Sant Christopher a Nevis
LC St Lucia St Lucia Saint Lucia Santes Lucia
VC St Vincent St Vincent Saint Vincent and the Grenadines Sant Vincent a'r Grenadines
SD Sudan Sudan The Republic of the Sudan Gweriniaeth Sudan
SR Suriname Suriname The Republic of Suriname Gweriniaeth Suriname
SE Sweden Sweden The Kingdom of Sweden Teyrnas Sweden
CH Switzerland Y Swistir The Swiss Confederation Cydffederasiwn y Swistir
SY Syria Syria The Syrian Arab Republic Gweriniaeth Arabaidd Syria
TJ Tajikistan Tajikistan The Republic of Tajikistan Gweriniaeth Tajikistan
TZ Tanzania Tanzania The United Republic of Tanzania Gweriniaeth Unedig Tanzania
TH Thailand Gwlad Thai The Kingdom of Thailand Teyrnas Gwlad Thai
BS The Bahamas Y Bahamas The Commonwealth of The Bahamas Cymanwlad y Bahamas
GM The Gambia Y Gambia The Republic of The Gambia Gweriniaeth y Gambia
TG Togo Togo The Togolese Republic Gweriniaeth Togo
TO Tonga Tonga The Kingdom of Tonga Teyrnas Tonga
TT Trinidad and Tobago Trinidad a Tobago The Republic of Trinidad and Tobago Gweriniaeth Trinidad a Tobago
TN Tunisia Tunisia The Tunisian Republic Gweriniaeth Tunisia
TR Turkey Twrci Republic of Türkiye Gweriniaeth Türkiye
TM Turkmenistan Turkmenistan Turkmenistan Turkmenistan
TV Tuvalu Tuvalu Tuvalu Tuvalu
UG Uganda Uganda The Republic of Uganda Gweriniaeth Uganda
UA Ukraine Wcráin Ukraine Wcráin
AE United Arab Emirates Yr Emiradau Arabaidd Unedig The United Arab Emirates Yr Emiradau Arabaidd Unedig
GB United Kingdom Y Deyrnas Unedig The United Kingdom of Great Britain and Northern Ireland Teyrnas Unedig Prydain Fawr a Gogledd Iwerddon
US United States Yr Unol Daleithiau The United States of America Unol Daleithiau America
UY Uruguay Uruguay The Oriental Republic of Uruguay Gweriniaeth Ddwyreiniol Uruguay
UZ Uzbekistan Uzbekistan The Republic of Uzbekistan Gweriniaeth Uzbekistan
VU Vanuatu Vanuatu The Republic of Vanuatu Gweriniaeth Vanuatu
VA Vatican City Dinas y Fatican Vatican City State Gwladwriaeth Dinas y Fatican
VE Venezuela Venezuela The Bolivarian Republic of Venezuela Gweriniaeth Bolivaraidd Venezuela
VN Vietnam Fietnam The Socialist Republic of Viet Nam Gweriniaeth Sosialaidd Fiet Nam
YE Yemen Yemen The Republic of Yemen Gweriniaeth Yemen
ZM Zambia Zambia The Republic of Zambia Gweriniaeth Zambia
ZW Zimbabwe Zimbabwe The Republic of Zimbabwe Gweriniaeth Zimbabwe