Last name Rosiak (Rosiak 
) , in all the world, is quite a common family name. The family name Rosiak is characteristic of Poland, where it is quite a common surname, Ireland, where it is a rare surname, and Denmark. In absolute terms, this name is the most popular in Poland, the United States, and Brazil. Also, Rosiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rosiak | Germany, France, Brazil, United States, Poland |
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stefan rosiak PL (b. 1897) |
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barbara rosiak Polish painter, PL (b. 1955) |
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aleksandra rosiak Polish journalist, PL (b. 1983) |
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| jerzy rosiak Polish politician, PL (b. 1946) |
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| janusz rosiak PL (b. 1946) |
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| marek rosiak Polish philosopher, PL (b. 1956) |
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| marek rosiak PL (b. 1948) |
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| dariusz rosiak Polish journalist, writer, podcaster, PL (b. 1962) |
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| elżbieta rosiak PL (b. 1957) |
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| mariusz rosiak Polish association football player, PL (b. 1973) |
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| małgorzata rosiak Polish sportsperson, PL (b. 1977) |
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| michał rosiak Polish association football player, PL (b. 1979) |
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| damian rosiak researcher |
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| angelina rosiak researcher |
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| natalia rosiak researcher |
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