Family name Bossak (Bossak 
) , all around the world, is a rare last name. The cognomen Bossak is characteristic of Croatia, where it is a rare surname, Poland, and Morocco, where it is a very rare surname. In absolute terms, it is commonest in Brazil, Poland, and the United States. Also, Bossak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Bossak | Germany, Morocco, United States, Poland, Brazil |
| jerzy bossak Polish film director, teacher and journalist (1910-1989), PL (b. 1910) |
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| maciej bossak Polish engineer, PL (b. 1935) |
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| władysław bossak PL (b. 1929) |
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| barbara bossak (b. 1936) |
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| karolina bossak researcher |
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| tatiana bossak Russian cyclist, RU |
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| william s. bossak physician |
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| barbara bossak (b. 1977) |
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