Last name Posthumus (Posthumus 
, Postum 
) , across the world, is quite a rare cognomen. The surname Posthumus is characteristic of Netherlands, where it is quite a common surname, South Africa, where it is quite a rare surname, and Canada, where it is a rare surname. In absolute terms, the name is most common in Netherlands, South Africa, and the United States.
| VARIANT | COUNTRY |
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| Posthumus | Germany, Netherlands, Canada, United States, South Africa |
| Postum | South Africa, India, United States |
| guido posthumus soldier, poet and physician, IT (b. 1479) |
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| herman posthumus German painter (1512-1566), DE (b. 1512) |
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| georg konrad posthumus, graf finck von finckenstein 24 Nov 1748 Gilgenburg - 12 Mar 1799 Jäskendorf (b. 1748) |
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| rinse posthumus (b. 1790) |
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| rinse posthumus NL (b. 1790) |
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nicolaas wilhelmus posthumus Dutch academic (1880-1960), NL (b. 1880) |
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annie posthumus Dutch translator, NL (b. 1881) |
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| nicolaas wilhelmus posthumus 1838-1885; ISNI: 0000 0000 5172 0703; http://viaf.org/viaf/51669186/ (b. 1838) |
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| jan daniël posthumus NL (b. 1839) |
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kees posthumus Dutch chemist, NL (b. 1902) |
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siep posthumus Dutch politician (1910-1987), NL (b. 1910) |
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sieta posthumus swimmer, NL (b. 1936) |
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| johannes posthumus Dutch gymnast, NL (b. 1887) |
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| pier obe posthumus Dutch politician, NL (b. 1887) |
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hans posthumus Dutch football player (1947-2016), NL (b. 1947) |
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