| EQUIVALENTS |
| ARABIC: Yakub, Yaqoob, Yaqub |
| ARMENIAN: Hagop, Hakob |
| BASQUE: Jakes |
| BIBLICAL GREEK: Iakobos |
| BIBLICAL HEBREW: Yaakov |
| BIBLICAL LATIN: Iacobus |
| BIBLICAL: Jacob, James |
| BULGARIAN: Yakov |
| CATALAN: Jaume |
| CORNISH: Jago |
| CROATIAN: Jakov |
| CZECH: Jakub |
| DANISH: Jacob, Jakob |
| DUTCH: Jacob, Jacobus, Jakob, Sjaak |
| ENGLISH: Jacob, James, Jaycob, Jaymes |
| ESTONIAN: Jaagup, Jaakob |
| FAROESE: Jákup |
| FINNISH: Jaakob, Jaakoppi |
| FRENCH: Jacques |
| GALICIAN: Iago |
| GEORGIAN: Iakob |
| GERMAN: Jakob |
| HAWAIIAN: Iakopa, Kimo |
| HEBREW: Akiba, Akiva, Yaakov, Yakov |
| HUNGARIAN: Jakab, Jákob |
| ICELANDIC: Jakob |
| IRISH: Séamas, Séamus, Shamus, Sheamus |
| ITALIAN: Giacobbe, Giacomo, Iacopo, Jacopo |
| JEWISH: Jacob |
| LATE ROMAN: Iacomus, Jacobus |
| LITHUANIAN: Jokūbas |
| MACEDONIAN: Jakov |
| MAORI: Hemi |
| NORWEGIAN: Jacob, Jakob |
| OLD CHURCH SLAVIC: Iakovu |
| POLISH: Jakub |
| PORTUGUESE: Iago, Jacó, Jaime |
| RUSSIAN: Yakov |
| SCOTTISH: Seumas |
| SERBIAN: Jakov |
| SLOVAK: Jakub |
| SLOVENE: Jakob |
| SPANISH: Jacobo, Jaime, Yago |
| SWEDISH: Jacob, Jakob |
| TURKISH: Yakup |
| UKRAINIAN: Yakiv |
| WELSH: Iago |
|
| DIMINUTIVES AND SHORT FORMS |
| CATALAN: Jaumet |
| CROATIAN: Jakša |
| DANISH: Ib, Jeppe |
| DUTCH: Cobus, Coos, Jaap, Kobe, Kobus, Koos, Sjakie |
| ENGLISH: Coby, Jae, Jake, Jamey, Jay, Jeb, Jem, Jemmy, Jim, Jimi, Jimmie, Jimmy, Koby |
| ESTONIAN: Jaak |
| FINNISH: Jaakko, Jaska |
| FLEMISH: Jaak |
| FRENCH: Jacky |
| FRISIAN: Japik |
| GEORGIAN: Koba |
| GERMAN: Jockel |
| ITALIAN: Lapo |
| POLISH: Kuba |
| RUSSIAN: Yasha |
| SCOTTISH: Jamie |
| SLOVENE: Jaka, Jaša |
| YIDDISH: Kapel, Koppel, Yankel |
|
| FEMININE FORMS |
| BULGARIAN: Zhaklina |
| CROATIAN: Žaklina |
| DANISH: Bine, Jacobine |
| DUTCH: Coba, Jacoba, Jacobina, Jacobine, Jacomina, Mina |
| ENGLISH (BRITISH): Jacquetta, Jacqui |
| ENGLISH: Jaci, Jackalyn, Jacki, Jackie, Jacklyn, Jaclyn, Jacqueline, Jacquelyn, Jaime, Jaimie, Jaki, Jakki, Jami, Jamie, Jaqueline, Jaquelyn, Jaye, Jayla, Jaylen, Jaylene, Jaylin, Jaylyn, Jayma, Jayme |
| FRENCH: Jacqueline, Jacquette |
| ITALIAN: Giacoma, Giacomina |
| LIMBURGISH: Mina |
| MACEDONIAN: Zhaklina |
| NORWEGIAN: Jacobine |
| POLISH: Żaklina |
| PORTUGUESE (BRAZILIAN): Jaqueline |
| SCOTTISH: Jamesina |
| SERBIAN: Žaklina |
|
| OTHER FORMS |
| BASQUE: Xanti |
| CATALAN: Dídac |
| ENGLISH: Jameson, Jamison |
| MEDIEVAL SPANISH: Didacus |
| PORTUGUESE (BRAZILIAN): Thiago |
| PORTUGUESE: Diogo, Santiago, Tiago |
| SCOTTISH: Hamish |
| SPANISH: Diego, Santiago |
|