Last name Wilhelmsen (Wilhelmsen 
) , throughout the world, is quite a common surname. The cognomen Wilhelmsen is characteristic of Norway, where it is quite a common surname, Denmark, where it is quite a rare surname, and Liberia. Not in comparison with a country's population, the name is most common in Norway, the United States, and Denmark.
| VARIANT | COUNTRY |
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| Wilhelmsen | Germany, Norway, Liberia, United States, Denmark |
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wilhelm wilhelmsen Norwegian shipping magnate (1839–1910), NO (b. 1839) |
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august wilhelmsen norwegian civil servant and bank manager, NO (b. 1861) |
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wilhelm wilhelmsen Norwegian ship owner (1872–1955), NO (b. 1872) |
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| hans wilhelmsen Norwegian missionary (b. 1841) |
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| anne marie wilhelmsen Norwegian missionary (b. 1843) |
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| wilhelmine wilhelmsen Norwegian missionary (1844-1920) (b. 1844) |
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| halfdan wilhelmsen Norwegian shipping magnate (1864–1923), NO (b. 1864) |
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| beathe marie elisabeth wilhelmsen Norwegian missionary (1874-1900) (b. 1874) |
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arne wilhelmsen Norwegian businessman (1929-2020), NO (b. 1929) |
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ingvard wilhelmsen Norwegian doctor, NO (b. 1949) |
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| anders wilhelmsen Norwegian ship-owner (1899-1969), NO (b. 1899) |
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| william wilhelmsen Norwegian association football player (1904-1984) (b. 1904) |
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gunnar wilhelmsen Norwegian labour party politician and business owner, NO (b. 1956) |
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| tom wilhelmsen Norwegian shipping magnate (1911–1978), NO (b. 1911) |
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| thorvald wilhelmsen Norwegian long-distance runner (b. 1912) |
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