Cognomen Kosmák (Kosmak 
, Kosmák ) , globally, is a rare surname. The cognomen Kosmák is habitual in Czechia, where it is a rare surname, Germany, where it is a very rare surname, and Australia. Measured by absolute frequency, it is commonest in Czechia, Germany, and the United States. Very seldom, Kosmák is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kosmak | Canada, United States, Czechia, Germany, Australia |
| Kosmák | Czechia |
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václav kosmák Czech priest and writer, CZ (b. 1843) |
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| rudolf kosmák Czechoslovak association football player (1913-), CZ (b. 1913) |
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| ivan kosmák CZ (b. 1923) |
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| milan kosmák CZ (b. 1927) |
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| ladislav kosmák (b. 1930) |
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