Cognomen Claessen (Νικόλαος 
, Claessen 
) , across the world, is quite a rare last name. The cognomen Claessen is characteristic of Iceland, where it is quite a common surname, Netherlands, where it is quite a rare surname, and Belgium. In absolute terms, the name is most common in Western Europe, particularly Netherlands, Belgium, and Germany. Much less frequently, Claessen is the forename as well as the last name.
| andries claessen NL (b. 1450) |
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| hans claessen (b. 1562) |
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| joannes claessen (b. 1570) |
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| joannes claessen (b. 1734) |
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| joannes claessen (b. 1734) |
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| johannes claessen (b. 1734) |
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| gerlacus claessen (b. 1747) |
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| heinrich bernhard claessen (b. 1763) |
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| heinrich bernhard claessen DE (b. 1763) |
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| evermodus claessen (b. 1767) |
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| anton gottfried claessen Catholic auxiliary bishop, DE (b. 1788) |
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| heinrich claessen DE (b. 1804) |
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| gustav claessen Prussian district administrator of the Erkelenz district, jurist and politician (1816-1875), DE (b. 1816) |
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| matthias claessen Prussian administrative official and district administrator (1821-1892), DE (b. 1821) |
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| theodor claessen DE (b. 1822) |
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