Family name Trzeciak (Trzeciak 
) , across the world, is quite a common surname. The last name Trzeciak is habitual in Poland, where it is quite a common surname, Ireland, where it is a rare surname, and Germany. Measured by absolute frequency, the name is most common in Poland, the United States, and Germany. Also, Trzeciak is the forename as well as the last name.
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| Trzeciak | Brazil, United States, Germany, Poland, France |
| celestyna trzeciak (b. 1810) |
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stanisław trzeciak Polish Catholic priest and Nazi collaborator (b. 1873, d. 1944), PL (b. 1873) |
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józef trzeciak (b. 1873) |
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| paweł trzeciak (b. 1847) |
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jan trzeciak PL (b. 1902) |
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| julia trzeciak UA (b. 1863) |
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jerzy trzeciak Polish aircraft designer (1928-1991), PL (b. 1928) |
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| georg trzeciak German politician (1886-1968), DE (b. 1886) |
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franciszek trzeciak Polish actor, PL (b. 1942) |
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wiesław henryk trzeciak PL (b. 1934) |
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| władysław trzeciak PL (b. 1891) |
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| ilse lisette trzeciak holocaust victim, b. 1909-04-19, DE (b. 1909) |
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| eufrozyna trzeciak Polish Righteous Among the Nations, PL (b. 1910) |
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| kazimierz trzeciak LT (b. 1901) |
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| maria trzeciak (b. 1901) |
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