Family name Klančnik (Klančnik 
) , all around the world, is a rare cognomen. The cognomen Klančnik is habitual in Southern Europe, particularly Slovenia, where it is quite a common surname, and Croatia, where it is a rare surname.
| simon klančnik (1810-1844), SI (b. 1810) |
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| janez klančnik SI (b. 1823) |
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gregor klančnik Slovene ski jumper and economist, SI (b. 1913) |
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karel klančnik ski jumper, SI (b. 1917) |
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| alojz klančnik cross-country skier (1912-1972), SI (b. 1912) |
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| cvetka klančnik - belin aviator (1931-1977), SI (b. 1931) |
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| maja klančnik SI (b. 1967) |
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| anja klančnik researcher, SI (b. 1978) |
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| marisa klančnik researcher |
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| tomaž klančnik soccer referee (b. 1982) |
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| simon klančnik SI |
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| tomaž klančnik SI |
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| laura klančnik SI |
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| tomaž klančnik SI |
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| katja klančnik SI |
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