Last name Trefný (Trefný 
) , all over the world, is a very rare family name. The cognomen Trefný is habitual in Eastern Europe, particularly Czechia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Trefný | Czechia |
|
jan trefný Czechoslovak painter, CZ (b. 1875) |
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| leopold trefný (b. 1892) |
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| eduard trefný (b. 1909) |
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| ladislav trefný (b. 1911) |
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| jiří trefný CZ (b. 1921) |
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| milan trefný (b. 1921) |
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| otto trefný Czech politician and doctor (1932-2019), CZ (b. 1932) |
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| zdeněk trefný CZ (b. 1926) |
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| jiří trefný CZ (b. 1946) |
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| pavel trefný (b. 1967) |
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| jakub trefný Czech ice hockey defenceman, CZ (b. 1981) |
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| martin trefný CZ (b. 1973) |
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| františek trefný |
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