Surname Janc (Janc 
, Янц 
, جانك) , all over the world, is quite a rare cognomen. The cognomen Janc is habitual in Slovenia, where it is quite a common surname, Lithuania, where it is quite a rare surname, and Poland. Not in comparison with a country's population, the name is most common in Poland, Slovenia, and Russia. Likewise, Janc is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Janc | United States, Lithuania, Slovenia, Poland, Germany |
| Янц | Ukraine, Kazakhstan, Russia, Belarus, Kyrgyzstan |
| andreas janc Austrian cross-country skier, AT (b. 1938) |
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blaž janc Slovenian handball player, SI (b. 1996) |
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| franci janc SI (b. 1937) |
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| marija janc SI (b. 1938) |
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| katarzyna janc Polish rower, PL (b. 1950) |
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| alfred janc Polish economist (b. 1951) |
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| marija janc Slovene economist, SI (b. 1956) |
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| branko janc Slovene economist and politician, SI (b. 1956) |
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| kristijan janc politician, SI (b. 1960) |
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| adolf janc SI (b. 1952) |
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| mirko janc Ph.D. University of Belgrade 1981 |
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| - janc Slovene association football player, SI |
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| helena janc Polish Righteous Among the Nations, PL |
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| tadeja janc researcher (ORCID 0000-0002-9786-7772) |
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| andreja janc SI (b. 1974) |
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