Surname Richardsen (Richardsen 
) , worldwide, is quite a rare last name. The family name Richardsen is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Iceland, where it is quite a rare surname, and Denmark, where it is a rare surname. Measured by absolute frequency, it is commonest in Norway, Germany, and the United States. Very seldom, Richardsen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Richardsen | Germany, Norway, Canada, United States, Denmark |
Richardson, Richardsson, Richardtson, Rickardsson, Rikardsen, Ричардсен, Ричардсон, Річардсон, and リチャードソン
| august richardsen German professor (1873-1957), DE (b. 1873) |
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| carl richardsen German politician (1896-1977), DE (b. 1896) |
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ingvild richardsen German academic, DE (b. 1963) |
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philipp richardsen Austrian musician, AT (b. 1976) |
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| oddvar richardsen Norwegian association football player (1937-1997), NO (b. 1937) |
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| astrid marie richardsen Norwegian professor (b. 1950) |
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| rune richardsen Norwegian association football player, NO (b. 1962) |
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| kåre rønn richardsen researcher |
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| astrid m richardsen researcher (ORCID 0000-0001-9548-9061) |
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| elin richardsen researcher |
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| uwe richardsen |
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| richard richardsen |
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| charles h. richardsen |
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| elise richardsen Norwegian association football player (b. 1991) |
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| wanja marie richardsen Norwegian archer (b. 1994) |
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