Cognomen Westermark (Westermark 
) , in the entire world, is quite a rare family name. The cognomen Westermark is characteristic of Sweden, where it is quite a rare surname, Finland, and Bahrain. Measured by absolute frequency, the name is most common in Sweden, Finland, and the United States.
| VARIANT | COUNTRY |
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| Westermark | Sweden, Norway, Finland, United States, Bahrain |
Westermarck, and Вестермарк
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gustaf edvard westermark SE (b. 1836) |
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| otto edvard westermark SE (b. 1797) |
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| august westermark actor (b. 1834) |
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herbert westermark sailor, SE (b. 1891) |
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nils westermark Sailor and radiologist (1892-1980), SE (b. 1892) |
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| ottilia westermark SE (b. 1835) |
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| frans westermark SE (b. 1853) |
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| axel westermark United States Navy Medal of Honor recipient, FI (b. 1875) |
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| ella westermark SE (b. 1888) |
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| malin westermark SE (b. 1888) |
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| karl johan westermark Norwegian photographer, NO (b. 1910) |
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| ulla westermark Swedish numismatist (1927-2020), SE (b. 1927) |
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| per westermark 1929-1954 (Per Erik Nils) poet (b. 1929) |
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| torbjörn westermark SE (b. 1923) |
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| bengt westermark swedish cancer researcher and professor (b. 1945) |
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