Worldwide, Jacobus (Jacobus 
, Ιάκωβος 
, Якобус 
) is a common masculine given name. The given name Jacobus is characteristic of South Africa, where it is a common male name, Suriname, where it is quite a common boy's name, and Namibia. Not in comparison with a country's population, it is commonest in South Africa, Indonesia, and Netherlands. Much less frequently, Jacobus is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Jacobus | Namibia, Indonesia, South Africa, United States, Netherlands |
| Ιάκωβος | Greece |
| Якобус | Kyrgyzstan, Russia, Ukraine |
Chaime, Diego, Džeimss, Fritaa, Giacomo, Iacobus, Iacopo, Jaakko, Jacb, Jacco, Jaco, Jacob, Jacobi, Jacobo, Jacobs, Jacobsen, Jacoby, Jacopo, Jacques, Jacó, Jacóbus, Jakab, Jakez, Jakob, Jakobus, Jakov, Jakow, Jakub, Jakubs, Jakubus, Jakób, Jakúb, James, Jaume, Jim, Jiminy, Jockel, Jokūbas, Jákob, Jämes, Merdaa, Santiago, Santjago, Seamus, Séamus, Thiago, Xacobe, Ya'Acov, Ya'Aqov, Yaacov,
Jacobus is also a name for the fictitious and mythical characters: Jacobus , the operatic character in the opera Brockes-Passion (Händel), Brockes Passion; Jacobus Van Curlet , the character in the opera The Goveror's Vrouw by John Erskine, The Governor's Vrouw; Jakub Wędrowycz , character in Konan Destylator; Kuba Potulicki and Jakub Kusy , among other works.
| jacobus de mediolano author (13th century) (b. 1201) |
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| jacobus de boragine (b. 1200) |
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| jacobus dictus magnus politician, DE (b. 1300) |
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| jacobus von eltville (b. 1325) |
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| jacobus de theramo (b. 1349) |
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| jacobus de agello author (15th century) (b. 1401) |
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| jacobus vide Franco-Flemish composer (b. 1405) |
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| jacobus de reno (b. 1446) |
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| jacobus barle (b. 1450) |
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| jacobus magdalius von gouda DE (b. 1470) |
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| jacobus apocellus Jacobus Apocellus of Ubstadt (d 1550), a correspondent of Desiderius Erasmus, cf. Contemporaries of Erasmus I, 67-68, DE (b. 1484) |
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jacobus zaffius Dutch pastor and theologian, NL (b. 1534) |
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| jacobus probst German theologian, DE (b. 1486) |
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jacobus pamelius Belgian bishop, BE (b. 1536) |
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| jacobus ludovicus strebaeus FR (b. 1481) |
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Nel, Pienaar, Du Toit, Grobler, Jordaan, Joubert, Erasmus, Viljoen, Vorster, Olivier, Prinsloo, Pieterse, Du Preez, Swanepoel, Pretorius, Potgieter, Du Plessis, Oosthuizen, Engelbrecht, Bezuidenhout, Van Den Berg, Van Der Merwe, Barnard, Coetzee, Strydom, Myburgh, Smit, Roux, Louw, Meyer, Steyn, Smith, Swart, Botha, Kotze, Marais, Janse Van Rensburg, Muller, Cloete, Bester, Burger, Kruger, De Wet, Jacobs, Theron, Visser, Venter, Fourie, Snyman, and Van Der Westhuizen