Cognomen Trnka (Trnka 
) , in all the world, is quite a common family name. The surname Trnka is habitual in Czechia, where it is quite a common surname, Slovakia, and Bosnia and Herzegovina. Not in comparison with a country's population, it is commonest in Czechia, Slovakia, and the United States. Much less frequently, Trnka is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Trnka | Austria, Bosnia and Herzegovina, Slovakia, Czechia, United States |
| wenzel trnka physician, professor, and amateur composer of the 18th century (1739-1791), AT (b. 1739) |
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| franz von trnka (1794-1859) (b. 1794) |
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| františek dobromysl trnka (1798-1837), CZ (b. 1798) |
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karel adam trnka CZ (b. 1853) |
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ottokar trnka Czech engineer (1871-1919), AT (b. 1871) |
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| václav trnka Czech Catholic priest, supporter of cooperative banking (ca1833-1877), CZ (b. 1833) |
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| heinrich trnka AT (b. 1835) |
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| karl trnka AT (b. 1841) |
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| františek trnka CZ (b. 1844) |
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| antonín trnka CZ (b. 1859) |
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| jan trnka Czech rail official and editor (1880-1967), CZ (b. 1880) |
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františek trnka Czech member of Czech Parliament (1992–1996), member of Czech National Council, agonomist and university educator, CZ (b. 1931) |
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| dominik trnka CZ (b. 1876) |
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| františek trnka CZ (b. 1878) |
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| rudolf trnka CZ (b. 1881) |
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