In the entire world, Robertus (Роберт 
, Robertus 
, روبرت 
, and others...) is a common boy's first name. The given name Robertus is habitual in Russia, where it is quite a common masculine name, Kazakhstan, and Ukraine. Measured by absolute frequency, the name is most common in Russia, Indonesia, and Ukraine. Very seldom, Robertus is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Роберт | Kazakhstan, Armenia, Russia, Belarus, Ukraine |
| Robertus | Germany, Indonesia, Russia, United States, Netherlands |
| روبرت | Iran, Sudan, Algeria, Egypt, Iraq |
| רוברט | Israel |
| Роберто | Kazakhstan, Armenia, Russia, Kyrgyzstan, Ukraine |
| Ρόμπερτ | Greece |
| Робертус | Kazakhstan, Russia, Ukraine |
Bert, Bob, Rob, Robat, Robert, Robertas, Roberth, Roberto, Roberts, Robrecht, Roope, Róbert, Röbi, Röpke, Μπομπ, Берт, Боб, Лысый, Репке, Роб, Робат, Робер, Робертас, Робертс, Робэрт, בוב, רוב, רוברטו, רוברטס, بوب, رابرت, روب, روبرتس, روبرتو, روبيرت, روبيرتو, বব, โรเบิร์ต, バート, ボブ, ロバーツ, ロバート, ロブ, ロベルト, ロベール, 伯波, 伯特, 罗伯, 罗布, 羅伯特,
Robertus is also a prevalent name for the fictitious and mythical characters: Rocky Balboa , the fictional character in the Rocky film series; Robert Baratheon , the character in A Song of Ice and Fire, Game of Thrones; Sideshow Bob , the fictional character from The Simpsons franchise; Mr. March , the fictional character from Louisa May Alcott's Little Women and Robert Langdon , the fictional character in series of books by Dan Brown, The Da Vinci Code, and in many other works.
| robertus flamesburiensis (b. 1135) |
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| robertus mansel Constable of the Principality of Antioch (b. 1175) |
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| robertus de saliceto author (1201-1400) (b. 1201) |
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| robertus magister author (13th century) (b. 1201) |
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| robertus de sorbona (b. 1201) |
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| robertus le bynt English Member of Parliament (b. 1250) |
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| salentinus robertus IT (b. 1272) |
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| robertus anglicus astronomer (b. 1300) |
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| robertus de stronzola author (14th century) (b. 1301) |
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robertus keuchenius Dutch university professor of history (1636-1673), NL (b. 1636) |
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robertus dixon British scientist, GB (b. 1647) |
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| robertus franz anton weigl AT (b. 1697) |
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| robertus stephanus henrici Townphysician and anatomist, Trondheim., DK (b. 1715) |
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| robertus keuchenius driessen Robert Keuchenius Driessen (1759 - 1831), NL (b. 1759) |
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| robertus hirsch Norwegian politician (b. 1790) |
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Adi, Wijaya, Wibowo, Susanto, Septian, Arianto, Chandra, Bambang, Prabowo, Gunawan, Nugroho, Handoyo, Vogelaar, Setiawan, Setyawan, Budianto, Prasetyo, Kurniawan, Pamungkas, Pujowidiyanto, Wicaksono, Bellarmino, Widodo, Bellarminus, Irawan, Ganjar, Aldy, Bayu, Robi, Evan, Heru, Ooms, Yudi, Angga, Agung, Aarts, Bagus, Putra, Dimas, Galih, Willy, Sinaga, Susilo, Aditya, Candra, Robert, Daniel, Hendra, and Kristianto