In the entire world, Gulielmus (ויליאם 
, Уильям 
, Gulielmus 
) is a very rare male first name. The forename Gulielmus is habitual in Lithuania, where it is a rare masculine name, Belgium, and Russia, where it is a very rare male name. Much less frequently, Gulielmus is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| ויליאם | Israel |
| Уильям | Kazakhstan, Russia, Kyrgyzstan, Ukraine, Lithuania |
| Gulielmus | Spain, Belgium, South Africa |
| ویلیام | Iran |
Bill, Ghilherme, Golem, Guglielmo, Guilherme, Guillaume, Guillem, Guillermo, Guillén, Gwilherm, Gwilym, Gwyllym, Vilem, Vilhelms, Viljams, Viljem, Vilmos, Vilém, Wilhelm, Wilhelm Carl, Wiliam, Will, Willem, William, Wm., Μπιλ, Бил, Билл, Біл, Білл, Вил, Вилем, Вилл, Виллем, Вилмос, Вилмош, Вилхелм, Вильгельм, Вильем, Вильмош, Вильям, Вилям, Вілем, Віллем, Вільгельм, Вільмош, Вільям, Гийом, Гильен, Гильерме,
Gulielmus is also a prevalent name for the fictitious and mythical characters: Captain Marvel , the fictional DC character, Batman: The Brave and the Bold; William Riker , the fictional character in Star Trek; Buck Rogers , the science fiction hero, Amazing Stories; Mr William Collins , the fictional character from Pride and Prejudice by Jane Austen, Pride & Prejudice and Roy Harper , the DC Comics character, Arrow, and in many other works.
| gulielmus caulius French antiquarian and collector, FR (b. 1496) |
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| gulielmus scepreus English Roman Catholic priest and scholar (b. 1540) |
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| janus gulielmus German philologist and poet, DE (b. 1555) |
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| gulielmus moore (b. 1590) |
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| gulielmus becanus born:1608|died:1683|; Becanus, Guillaume 1608-1683 S.I.; Beke, Guillaume van der, 1608-1683; Van der Beke, Guillaume, 1608-1683; Becanus, Guillaume, 1608-1683; Beke, Guillaume van der; Becanus, Gulielmus; Beke, Willem van der, 1608-1683; Becanus, Gui (b. 1608) |
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| gulielmus scales (born 1685) (b. 1685) |
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| gulielmus vermaten (b. 1700) |
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gulielmus marinus de rossum Catholic cardinal (1854–1932), NL (b. 1854) |
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| gulielmus van hooff (b. 1840) |
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| gulielmus palmen (b. 1882) |
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| gulielmus d' amour Dutch poet (17th century) |
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| gulielmus derrix fl. 1713 |
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| gulielmus nicolai Dutch scientific instrument maker, BE |
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| gulielmus peregrinus English poet |
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| gulielmus totani |
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