Cognomen Oja (Oja 
, Оя 
, Ойя ) , in the entire world, is a common last name. The last name Oja is characteristic of Northern Europe, particularly Estonia, where it is a common surname, Finland, where it is quite a common surname, and Latvia, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in India, Estonia, and Finland. Much less frequently, Oja is the forename as well as the last name.
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onni oja Finnish painter (1909-2004), FI (b. 1909) |
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| matti oja Finnish politician, FI (b. 1865) |
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bruno oja Estonian-Polish actor (1933-2002), EE (b. 1933) |
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olev oja Estonian conductor, EE (b. 1935) |
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| juhan oja Estonian engineer, EE (b. 1885) |
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| frits oja Estonian technologist, topographer and military personnel, EE (b. 1887) |
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| benedikt oskar oja Estonian politician, EE (b. 1888) |
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| voldemar oja Soviet teacher (1894-1989), EE (b. 1894) |
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eve oja Estonian mathematician (1948-2019), EE (b. 1948) |
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| leonhard oja EE (b. 1894) |
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| johans oja sprinter, LV (b. 1904) |
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| eduard oja Estonian composer and conductor (1905-1950), EE (b. 1905) |
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tõnu oja Estonian geographer, ecologist and mathematician, EE (b. 1955) |
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peeter oja Estonian actor, EE (b. 1960) |
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| niilo oja FI (b. 1904) |
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