Family name Košťák (Košťák 
) , throughout the world, is a very rare cognomen. The family name Košťák is characteristic of Eastern Europe, particularly Czechia, where it is a rare surname.
| joan. košťák (b. 1838) |
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| jaroslav košťák (b. 1906) |
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| václav košťák CZ (b. 1924) |
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| blahoslav košťák (b. 1931) |
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| jaromír košťák CZ (b. 1941) |
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| ondřej košťák CZ (b. 1960) |
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| martin košťák researcher, CZ (b. 1971) |
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| david košťák CZ (b. 1991) |
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