Family name Nielsen (Nielsen 
, Нільсен 
, Нильсен 
) , all over the world, is a widespread last name. The cognomen Nielsen is characteristic of Denmark, where it is a prevalent surname, Greenland, and Norway, where it is a common surname (explore the name in all countries). Measured by absolute frequency, it is commonest in Denmark, the United States, and Norway. Very seldom, Nielsen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Nielsen | Germany, Sweden, Norway, United States, Denmark |
| Нільсен | Ukraine |
| Нильсен | Ukraine, Russia, Kazakhstan |
| נילסן | Israel |
| jacob nielsen, count of halland Count of Northern Halland (b. 1201) |
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| jens nielsen Swedish historical figure (b. 1250) |
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christopher nielsen tønder Danish-Norwegian civil servant (1587-1656), DK (b. 1587) |
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| villads nielsen Norwegian physician (b. 1564) |
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| hans nielsen composer (b. 1580) |
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| laurids nielsen (b. 1587) |
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| anders nielsen hatt Danish wood carver, DK (b. 1601) |
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| werner nielsen (1625-1695), DK (b. 1625) |
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| niels nielsen Danish landowner (1636-1708), DK (b. 1636) |
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| niels nielsen Danish-Norwegian merchant (1700-1786) (b. 1700) |
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jacob nielsen Norwegian politician (1768-1822), NO (b. 1768) |
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| georg nielsen DK (b. 1710) |
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nicolai niels nielsen Norwegian politician, DK (b. 1777) |
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wilhelm theodor wegener nielsen DK (b. 1793) |
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anna helene dorothea nielsen Danish actor and opera singer (1803-1856), DK (b. 1803) |
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