Surname Dominicus (Dominik 
, Dominicus 
, Доминик 
) , in all the world, is a common cognomen. The surname Dominicus is habitual in Poland, where it is quite a common surname, Eswatini, where it is quite a rare surname, and Hungary. Measured by absolute frequency, this name is the most popular in Poland, Germany, and the United States. More frequently, Dominicus is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Dominik | Germany, Austria, Croatia, Czechia, Poland |
| Dominicus | Germany, Austria, India, Czechia, Poland |
| Доминик | Belarus, Russia, Kazakhstan, Ukraine |
| dominicus dominici de viseu Dominican author and canonist (b. 1200) |
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| dominicus krafft DE (b. 1250) |
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| dominicus bonfius author (15th century) (b. 1401) |
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| dominicus de catalonia Dominican friar (15th century) (b. 1401) |
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dominicus sleupner German theologian, DE (b. 1483) |
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| dominicus de flandria (b. 1425) |
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| dominicus bildhower CH (b. 1450) |
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| dominicus pahr Swedish architect, SE (b. 1505) |
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dominicus corea King of Kotte and Sitawaka, LK (b. 1565) |
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dominicus arumaeus Dutch lawyer (1579-1637), NL (b. 1579) |
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| dominicus custos Flemish artist, printer and copperplate engraver (1560-1612), BE (b. 1560) |
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| dominicus tschudi CH (b. 1557) |
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| dominicus dreuer German regional historian, DE (b. 1568) |
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| dominicus van heemskerck (1570-1624) (b. 1570) |
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| dominicus sapma (b. 1586) |
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