Family name Klasa (Klasa 
) , in the entire world, is quite a rare cognomen. The last name Klasa is habitual in Poland, where it is quite a rare surname, Czechia, where it is a rare surname, and Sweden. Measured by absolute frequency, the name is most common in Poland, Czechia, and the United States. Also, Klasa is the forename as well as the last name.
| józef klasa PL (b. 1931) |
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| michal klasa Czech biker, CZ (b. 1953) |
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| stanislas klasa Ph.D. Université de Genève 1968 |
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| jacqueline klasa Thèse de troiisème cycle Université de Paris 1971 |
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| katarzyna klasa researcher |
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| łukasz klasa researcher (ORCID 0000-0002-3175-2008) |
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