Cognomen Portus (Part 
, Port , Portus 
) , all over the world, is a common last name. The last name Portus is habitual in Estonia, where it is quite a common surname, Kuwait, where it is quite a rare surname, and Lesotho. Not in comparison with a country's population, it is the most numerous in Indonesia, the United States, and Germany. Much less frequently, Portus is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Port, Part | Brazil, France, United States, Germany, Indonesia |
| Portus | Brazil, Spain, United Kingdom, United States, Germany |
| Porz | Brazil, Spain, France, United States, Germany |
| emile portus IT (b. 1550) |
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| alexander portus politician (b. 1834) |
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| alexander brown portus Alexander Brown Portus (1834-1905) 1906 Obituary [1] ALEXANDER BROWN PORTUS, born on the 21st February, 1834, at Black Creek, Hunter River, Ne... (b. 1834) |
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| cyril portus (1881-1925) (b. 1881) |
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| garnet vere portus Australian historian, AU (b. 1883) |
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| ronald bayly portus (1904-1962) (b. 1904) |
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| henry bayly portus (1906-1955) (b. 1906) |
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| douglas roland portus (1910-1956) (b. 1910) |
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| leocán portus Chilean politician (1923-2006), CL (b. 1923) |
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| terence bayly portus Peerage person ID=653215 (b. 1939) |
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| sandra bayly portus Peerage person ID=653212 (b. 1940) |
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| robert bayly portus (born 1941) (b. 1941) |
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| anthony portus (born 1942) (b. 1942) |
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| geraldine josephine portus Peerage person ID=653217 (b. 1943) |
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| john mclaughlin bayly portus Peerage person ID=653213 (b. 1945) |
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