Cognomen Bartosiak (Bartosiak 
) , across the world, is quite a rare family name. The last name Bartosiak is characteristic of Poland, where it is quite a rare surname, Ireland, where it is a rare surname, and Sweden. Not in comparison with a country's population, the name is most common in Poland, the United States, and Germany. More frequently, Bartosiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Bartosiak | United Kingdom, Germany, Poland, Brazil, United States |
| wacław bartosiak PL (b. 1897) |
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| wincenty bartosiak (b. 1901) |
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jacek bartosiak Polish lawyer, an attorney, a geopolitician, PL (b. 1976) |
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| marek bartosiak Polish footballer, PL (b. 1948) |
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| andrzej bartosiak ice hockey player, PL (b. 1954) |
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| adam bartosiak PL (b. 1945) |
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| mariusz bartosiak (b. 1963) |
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| eugenia bartosiak Polish Righteous Among the Nations, PL |
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| bartłomiej bartosiak Polish footballer, PL (b. 1991) |
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