In the world, Viljem (Viljem 
) is a rare masculine forename. The first name Viljem is habitual in Slovenia, where it is quite a common masculine name, Croatia, where it is a rare masculine name, and Czechia. Measured by absolute frequency, the name is most common in Southern Europe, particularly Slovenia, Croatia, and Italy. Much less frequently, Viljem is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Viljem | Croatia, Italy, Slovenia, Czechia, North Macedonia |
Bill, Guglielmo, Guilherme, Guillaume, Guillem, Guillermo, Guillén, Gulielmus, Gwilym, Vilem, 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, Вільгельм, Вільмош, Вільям, Гийом, Гильен, Гильерме, Гильермо, Гійом, Гільєрмо, Уилл, Уильям, Уилям, Уільям,
| viljem praunsperger Mayor of Ljubljana (b. 1497) |
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viljem urbas SI (b. 1831) |
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viljem pfeifer Slovenian politician, SI (b. 1842) |
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viljem polak SI (b. 1843) |
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| viljem künl Slovene painter, SI (b. 1811) |
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| viljem unger AT (b. 1805) |
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viljem putick CZ (b. 1856) |
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viljem rohrman SI (b. 1862) |
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| viljem kovač Slovene surgeon, SI (b. 1830) |
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| viljem ogrinc SI (b. 1845) |
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| viljem treo SI (b. 1845) |
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| viljem linhart AT (b. 1846) |
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| viljem schweitzer SI (b. 1866) |
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viljem ščuka psychotherapist, SI (b. 1938) |
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| viljem požgaj SI (b. 1879) |
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Ny, Fermišek, Skornik, Kalamar, Krizman, Pavlič, Pestotnik, Godnich, Nožarić, Črtalič, Svetanič, Ambrozic, Psenicny, Ravnikar, Škornik, Brielmayer, Jamnik, Kovačič, Glavan, Pfundner, Ek, Kic, Urh, Orel, Gregl, Lango, Lovec, Novak, Iskra, Miolin, Strnad, Kovač, Kercmar, Krivec, Pečnik, Rupnik, and Pšeničny