Family name Ohnstad (Ohnstad 
) , around the world, is a rare last name. The cognomen Ohnstad is habitual in Norway, where it is quite a rare surname, the United States, where it is a rare surname, and Spain, where it is a very rare surname.
| anders ohnstad Norwegian historian (b. 1911) |
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| mike ohnstad American politician, US (b. 1926) |
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| åsmund ohnstad Norwegian writer (b. 1950) |
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| terje ohnstad Norwegian politician (b. 1951) |
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| tod ohnstad American politician in Wisconsin (born 1952), US (b. 1952) |
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| bente ohnstad NO (b. 1953) |
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| mari o ohnstad researcher |
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| mitch ohnstad college basketball player (1997–2000) Cal Poly; Minnesota |
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