In the world, Якобус (Jacobus 
, Yakobus 
, Якобус 
) is a common boy's first name. The first name Якобус is habitual in South Africa, where it is a common boy's name, Suriname, where it is quite a common masculine name, and Namibia. Not in comparison with a country's population, it is the most numerous in South Africa, Indonesia, and Netherlands. Very seldom, Якобус is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Jacobus | Namibia, Indonesia, South Africa, United States, Netherlands |
| Yakobus | Bulgaria, Indonesia, Malaysia, United States |
| Якобус | Kyrgyzstan, Russia, Ukraine |
Chaime, Diego, Džeimss, Giacomo, Iacobus, Iacopo, Iakobus, Jaakko, Jacb, Jacco, Jaco, Jacob, Jacobo, Jacopo, Jacques, Jacó, Jakab, Jakez, Jakob, Jakobus, Jakov, Jakow, Jakub, Jakubs, Jakób, Jakúb, James, Jaume, Jim, Jiminy, Jockel, Jokūbas, Jákob, Jämes, Santiago, Santjago, Seamus, Séamus, Thiago, Van, Xacobe, Ya'Acov, Ya'Aqov, Yaacov, Yaakov, Yaaqov, Yacob, Yakiv, Yakov, Yakub,
Якобус is also a name for the fictitious and mythical characters: Jacobus , the operatic character in the opera Brockes-Passion (Händel), Brockes Passion and Jacobus Van Curlet , the character in the opera The Goveror's Vrouw by John Erskine, The Governor's Vrouw.