Cognomen Germanus (Germain 
, Germán 
, Germanus 
) , all over the world, is a common family name. The last name Germanus is characteristic of Seychelles, where it is quite a common surname, Guadeloupe, and Haiti (explore the name in all countries). Measured by absolute frequency, it is the most numerous in France, the United States, and Canada. Also, Germanus is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Germain | Democratic Republic of the Congo, France, Cameroon, Ivory Coast, United States |
| Germán | Mexico, United States, Colombia, Dominican Republic, Canada |
| Germanus | Belgium, France, Cameroon, Tanzania, United States |
| Germane | Democratic Republic of the Congo, France, Venezuela, United States, Canada |
| trebius germanus Roman governor of Britain around AD 127 (b. 50) |
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| aurelius germanus ancient olympics victor, EG (b. 300) |
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germanus of man French saint, FR (b. 410) |
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| germanus Roman general under Phocas, TR (b. 501) |
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germanus von granfelden first abbot of Moutier-Grandval Monastery, DE (b. 612) |
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germanus i of constantinople Patriarch of Constantinople (b. 634) |
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| germanus of winchester Abbot of Ramsey Abbey; Abbot of Winchecombe Abbey; Abbot of Cholsey Abbey (b. 950) |
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| germanus ii of constantinople Patriarch of Constantinople (b. 1101) |
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| germanus iii of costantinople Ecumenical Patriarch in 1266 (b. 1250) |
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henricus martellus germanus German cartographer, DE (b. 1401) |
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| nicolaus germanus (b. 1410) |
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| donnus nicolaus germanus German cartographer (b. 1420) |
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| germanus luidtke DE (b. 1592) |
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| germanus hermann (b. 1648) |
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| germanus lüdke German theologian, DE (b. 1683) |
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