Surname Třetina (Třetina 
) , across the world, is a very rare last name. The family name Třetina is characteristic of Eastern Europe, particularly Czechia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Třetina | Czechia |
|
tomáš třetina politician, CZ (b. 1972) |
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| františek třetina CZ (b. 1920) |
|
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| michal třetina CZ (b. 1962) |
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| miroslav třetina Czech ice hockey player, CZ (b. 1980) |
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