Family name Trtnik (Trtnik 
) , in the world, is a rare surname. The cognomen Trtnik is characteristic of Slovenia, where it is quite a common surname, Montenegro, where it is quite a rare surname, and Canada, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Trtnik | Slovenia, Canada, Montenegro |
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anton trtnik SI (b. 1908) |
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| milan trtnik Slovene partisan (1925-2010), SI (b. 1925) |
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| olga trtnik SI (b. 1921) |
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| boštjan trtnik SI (b. 1971) |
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| renata anžič trtnik SI (b. 1975) |
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| gregor trtnik SI (b. 1979) |
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| jože trtnik |
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| živa trtnik SI |
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| janez trtnik SI |
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