Last name Welin (Welin 
) , in all the world, is quite a rare surname. The cognomen Welin is habitual in Northern Europe, particularly Sweden, where it is quite a common surname, Finland, where it is quite a rare surname, and Norway, where it is a rare surname. Not in comparison with a country's population, the name is most common in Sweden, Finland, and Indonesia. Much less frequently, Welin is the forename as well as the last name.
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| Welin | Indonesia, United States, Sweden, Finland, Dominican Republic |
| john welin Professor in logics and metaphysics, Åbo, Finland (1705-1744) (b. 1705) |
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agnes welin 1844–1928, missionary to seafarers, SE (b. 1844) |
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karl sanfrid viktor welin Swedish museum director, SE (b. 1855) |
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gustaf welin Swedish politician (1859-1945), SE (b. 1859) |
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wilhelm welin Swedish merchant and museum director (1859-1947), SE (b. 1859) |
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axel welin Swedish businessman (1862-1951), SE (b. 1862) |
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| carl welin SE (b. 1811) |
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| olof august welin SE (b. 1841) |
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sölve welin SE (b. 1903) |
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rune welin (b. 1904) |
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| henrik welin SE (b. 1863) |
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| kurt welin Swedish actor (1896-1930), SE (b. 1896) |
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| axel welin Swedish military personnel, SE (b. 1899) |
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| malte welin SE (b. 1896) |
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| erik welin SE (b. 1907) |
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