Surname Grzesiak (Grzesiak 
, Гжесяк 
) , across the world, is quite a common cognomen. The family name Grzesiak is characteristic of Poland, where it is quite a common surname, France, where it is a rare surname, and Ireland. In absolute terms, it is the most numerous in Poland, France, and the United States. More frequently, Grzesiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Grzesiak | Germany, United Kingdom, France, Poland, United States |
| Гжесяк | Belarus, Ukraine, Russia |
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józef grzesiak Polish boxer, PL (b. 1941) |
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| józef grzesiak Polish scouting leader and resistance fighter, PL (b. 1900) |
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| henryk grzesiak Polish Righteous Among the Nations, PL (b. 1911) |
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zbigniew grzesiak association football player, PL (b. 1965) |
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| łucja grzesiak Polish Righteous Among the Nations, PL (b. 1918) |
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| tadeusz grzesiak PL (b. 1912) |
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| zofia grzesiak PL (b. 1914) |
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anna grzesiak Polish triathlete, PL (b. 1987) |
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| zbigniew grzesiak Polish politician, PL (b. 1943) |
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| angela grzesiak (b. 1935) |
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| grażyna grzesiak-janas Polish dentist, PL (b. 1952) |
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| piotr grzesiak PL (b. 1949) |
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| maciej grzesiak Ph.D. Uniwersytet im. Adama Mickiewicza w Poznaniu 1985 |
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| jakub grzesiak researcher |
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| katarzyna grzesiak Polish researcher, PL |
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