Last name Mortensen (Mortensen 
, Мортенсен 
, מורטנסן 
) , all around the world, is a common cognomen. The last name Mortensen is habitual in Denmark, where it is a common surname, Greenland, and Norway, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is commonest in Denmark, the United States, and Norway.
| VARIANT | COUNTRY |
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| Mortensen | Norway, Canada, Sweden, United States, Denmark |
| Мортенсен | Russia, Ukraine |
| מורטנסן | Israel |
Martensson, Marthinsen, Marthinsson, Martienssen, Martinsen, Mortenson, Mortensson, Mårtensen, Mårtenson, Mårtensson, Mórtensen, Мартинсен, Мартінсен, Мортенсон, and Мортенссон
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claus mortensen tøndebinder (b. 1499) |
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| jens mortensen (b. 1550) |
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martin mortensen Danish gardener (1801-1867), DK (b. 1801) |
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mads mortensen NO (b. 1806) |
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hans christian cornelius mortensen Danish teacher and ornithologist, DK (b. 1856) |
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peter mortensen FO (b. 1852) |
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| morten mortensen Norwegian politician, NO (b. 1816) |
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niels juel mortensen FO (b. 1860) |
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| dánjal jákup mortensen FO (b. 1814) |
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johan mortensen SE (b. 1864) |
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| hans mortensen botanist (1825-1908), DK (b. 1825) |
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h. j. mortensen American lawyer and politician (1876-1970), US (b. 1876) |
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| johan mortensen FO (b. 1816) |
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christian mortensen Danish supercentenarian and second-longest-lived man (1882–1998), US (b. 1882) |
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| carl mortensen Danish song teacher and composer (b. 1832) |
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