Family name Iacobus (James 
, Jacob , Jacques , along with others...) , all over the world, is a prevalent cognomen. The surname Iacobus is characteristic of Latin America and the Caribbean, particularly Saint Lucia, where it is a prevalent surname, Saint Vincent and the Grenadines, where it is a widespread surname, and Antigua and Barbuda (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Nigeria, the United States, and Tanzania. More frequently, Iacobus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jacques, James, Jacob | United Kingdom, Kenya, France, United States, Nigeria |
| Séamas | Ireland, United Kingdom |
| Iacobus | Romania, Italy |
Chaime, Diego, Džeimss, Džejms, Giacomo, Giacôbê, Hakob, Iacopo, Jaakko, Jacobo, Jacobus, Jacopo, Jacum, Jaime, Jakob, Jakobus, Jakov, Jakow, Jakub, Jakubs, Jakup, Jakupi, Jakë, Jakób, Jakúb, Jaume, Jim, Jokūbas, Jákob, Qup, Qupi, Santiago, Santiago De Compostela, Santjago, Seumas, Séamus, Xacobe, Ya'Acov, Ya'Aqov, Yaacov, Yaakov, Yaaqov, Yacob, Yakov, Yakub, Yakup, Yaqoob, Yaqoub, Yaqub, Zhak, Çup, Ζακ, Ιάκωβος, Τζιμ, Джакомо, Джейкоб, Джеймс, Джекобс, Джим, Джимми, Джым, Джэймс, Диего, Дієго, Жак, Жауме, Иаков, Йацобус, Йокубас, Сантьяго, Шимус, Яакко, Яаков, Якаб, Якав, Якоб, Якобс, Якобус, Яков, Якопо, Якуб, Якуп, Якъуб, Яків, Яша, Іаков, Џими, ג'יימס, דייגו, ז'אק, ז'ק, חקובו, יענקלה, יעקב, יעקוב, יקופ, סנטיאגו, עקב, קובי, جاك, جاكوب, جاكوبس, جيم, جيمس, جیمس, دييغو, سانتياغو, شيموس, ياكوب, يعقوب, ژاک, ইয়াকুব, জিম, জেমস, იაკოვი, ジェイムス, ジェイムズ, ジェームス, ジェームズ, ジエームス, ジム, ジャック, ディエゴ, 占士, 吉姆, 吉米, 詹姆斯, 迭戈, 雅克, 雅可, and 雅各
| iacobus de corbaszano author (13th century) (b. 1201) |
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| iacobus aegidius de viterbo author (13th century) (b. 1201) |
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| iacobus calbeti author (13th century) (b. 1201) |
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| iacobus de ravanis author (13th century) (b. 1201) |
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| iacobus broncinus author (13th century) (b. 1201) |
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| iacobus de bonannis author (14th century) (b. 1301) |
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| iacobus serlandini author (14th century) (b. 1301) |
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| iacobus de belpoint author (14th century) (b. 1301) |
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| iacobus foroliviensis Italian physician and philosopher, IT (b. 1364) |
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| iacobus de calicio (1367-1434) (b. 1367) |
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| iacobus de podio author (15th century) (b. 1401) |
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| iacobus de isolanis author (15th century) (b. 1401) |
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| iacobus prior aureliensis author (15th century) (b. 1401) |
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| iacobus gentilis de perusio author (15th century) (b. 1401) |
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| iacobus antonius de gentis author (15th century) (b. 1401) |
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