Surname Oltmanns (Oltmanns 
) , globally, is quite a rare last name. The cognomen Oltmanns is habitual in Germany, where it is quite a rare surname, the United States, where it is a rare surname, and Canada, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Oltmanns | Canada, Tanzania, Australia, United States, Germany |
| jabbo oltmanns German Astronomer (1783-1833), DE (b. 1783) |
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| friedrich oltmanns German phycologist (1860-1945), DE (b. 1860) |
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| hayo tjarks oltmanns (b. 1878) |
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| ippo oltmanns (b. 1883) |
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reimar oltmanns German journalist, DE (b. 1949) |
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| willi oltmanns German painter (1905-1979), DE (b. 1905) |
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jan oltmanns German Protestant clergyman and port chaplain, DE (b. 1956) |
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gudrun oltmanns German sculptor and painter (1959-2001), DE (b. 1959) |
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jutta oltmanns German writer, DE (b. 1964) |
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torsten oltmanns German writer, DE (b. 1964) |
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| georg oltmanns DE (b. 1915) |
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| brigitte oltmanns German politician (1934-2013), DE (b. 1934) |
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| thomas f. oltmanns psychologist (b. 1949) |
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| larry oltmanns American architect (1951-), US (b. 1951) |
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| caroline oltmanns German concert pianist and pedagogue, DE (b. 1962) |
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