Cognomen Olesiak (Olesiak 
) , in all the world, is quite a rare surname. The last name Olesiak is habitual in Poland, where it is quite a rare surname, Germany, where it is a very rare surname, and Hungary. Measured by absolute frequency, the name is most common in Poland, the United States, and Germany. Also, Olesiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Olesiak | Germany, Brazil, Poland, United Kingdom, United States |
| jerzy olesiak Polish sportsperson, PL (b. 1930) |
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| kazimierz olesiak politician, PL (b. 1937) |
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| henryk olesiak (b. 1932) |
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| mieczysław olesiak association football player (b. 1954) |
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| maria olesiak PL |
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