Cognomen Mathiasen (Mathiasen 
) , in the world, is quite a rare last name. The last name Mathiasen is habitual in Northern Europe, particularly Denmark, where it is quite a common surname, Sweden, where it is a rare surname, and Latvia. Measured by absolute frequency, the name is most common in Denmark, the United States, and Argentina.
| VARIANT | COUNTRY |
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| Mathiasen | Sweden, Canada, Denmark, United States, Argentina |
Mathiason, Mathiassen, Mathiasson, Mathiesen, Mathisen, Matthiasen, Matthiesen, Matthiessen, Matthisen, Матисен, and คณิตศาสตร์
| georg e. mathiasen (b. 1876) |
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| jakob mathiasen Danish paralympic athlete (b. 1901) |
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| jens mathiasen DK (b. 1920) |
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| poul mathiasen Danish footballer (b. 1947) |
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| lennart mathiasen Danish canoeist (b. 1948) |
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| lissa mathiasen Danish politician, DK (b. 1948) |
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| jan mathiasen Danish competitive sailor and Olympic medalist, DK (b. 1957) |
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| anders-peter mathiasen Danish journalist (b. 1959) |
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| dwight mathiasen Canadian ice hockey player, CA (b. 1963) |
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| mette mathiasen Danish rower (b. 1975) |
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| victor dahl mathiasen researcher (ORCID 0000-0003-2965-6348) |
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| rené mathiasen researcher |
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| mia krogager mathiasen researcher |
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| nanna kildahl mathiasen researcher |
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| anders bruun mathiasen researcher |
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