Cognomen Helmersen (Helmersen 
, Гельмерсен 
) , all over the world, is quite a rare last name. The last name Helmersen is characteristic of Northern Europe, particularly Norway, where it is quite a common surname, Denmark, where it is quite a rare surname, and Lithuania, where it is a rare surname. In absolute terms, the name is most common in Norway, Denmark, and the United States. Much less frequently, Helmersen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Helmersen | Sweden, Norway, Panama, United States, Denmark |
| Гельмерсен | Ukraine |
Helmerson, Helmersson, Хелмерсен, and เฮลเมอร์เซน
| eva helena von helmersen, heiress of moritzberg 8 Mar 1691 or 1695 Moritzberg - 19 Apr 1756 or 15 Sep 1756 Erlaa (b. 1691) |
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| otto friedrich v. helmersen, a. duckershof Statthalter von Oesel (b. 1728) |
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gregor von helmersen Baltic German geologist, EE (b. 1803) |
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| peter helmersen (b. 1776) |
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| paul von helmersen (1801-1894) (b. 1801) |
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| reinhold johann magnus von helmersen (b. 1801) |
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| theodor von helmersen (b. 1806) |
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| peter helmersen (b. 1838) |
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| wilhelm helmersen (b. 1838) |
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| georg von helmersen (b. 1840) |
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| nikolai von helmersen (b. 1842) |
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| ludwig helmersen (b. 1843) |
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| viktor von helmersen (b. 1843) |
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| joachim von helmersen (b. 1905) |
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| odd helmersen Norwegian painter (1922-2012) (b. 1922) |
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