Cognomen Kos (Kos 
, Cost 
, Cause 
) , all over the world, is a common family name. The family name Kos is characteristic of Southern Europe, particularly Slovenia, where it is a common surname, Croatia, and Bosnia and Herzegovina, where it is quite a common surname (explore the name in all countries). In absolute terms, this name is the most popular in Croatia, Poland, and Slovenia. Much less frequently, Kos is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kos | Poland, United States, Croatia, Czechia, Slovenia |
| Cost | Netherlands, United States, Indonesia, Turkey, Germany |
| Cause | Brazil, United States, Australia, France, Myanmar |
| Кос | Kyrgyzstan, Russia, Kazakhstan, Ukraine, Belarus |
| nikanor aus kos GR (b. 500) |
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| feliks kos (b. 1570) |
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| adam kos bishop of Chełm, PL (b. 1620) |
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| jan kos (b. 1630) |
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| józef mikołaj kos Polish statesman (b. 1680) |
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| józef kos IT (b. 1680) |
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| jakub kos CZ (b. 1726) |
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ivan kos Slovene entrepreneur and chess player, SI (b. 1846) |
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anton kos SI (b. 1837) |
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franc kos Slovene historian, SI (b. 1853) |
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| jan kos (b. 1796) |
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jan uhr kos Swedish missionary, SE (b. 1858) |
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fran kos Slovene zoologist, SI (b. 1885) |
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milko kos Slovene historian, IT (b. 1892) |
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ivan kos Slovene painter, SI (b. 1895) |
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