Family name Greń (Greń 
) , around the globe, is a rare cognomen. The last name Greń is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname.
| józef greń (b. 1900) |
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| jerzy greń Polish mathematician and statistician, PL (b. 1936) |
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| roman greń Polish politician, PL (b. 1937) |
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| zygmunt greń PL (b. 1930) |
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| zbigniew greń Polish linguist, PL (b. 1954) |
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| kazimierz greń politician (b. 1962) |
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| agnieszka greń Polish biologist, PL (b. 1970) |
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| czesław greń Polish entomologist, PL |
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Aga, Jacek, Jakub, Hanna, Filip, Irena, Iwona, Marcin, Maciej, Monika, Milena, Sabina, Sylwia, Szymon, Alicja, Konrad, Patryk, Robert, Renata, Daniel, Damian, Leszek, Gosia, David, Daria, Roman, Ewa, Sara, Anna, Ania, Arek, Adam, Kuba, Maria, Marta, Marek, Janusz, Magda, Anita, Artur, Basia, Beata, Karol, Kamil, Kasia, Paweł, Piotr, Rafał, Majka, and Joanna