Surname Kairiūkštis (Kairiūkštis 
, Кайрюкштис 
) , in the world, is a very rare cognomen. The surname Kairiūkštis is habitual in Lithuania, where it is a rare surname, and Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kairiūkštis | Lithuania |
| Кайрюкштис | Ukraine |
| juozas kairiūkštis LT (b. 1855) |
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| jonas kairiūkštis PL (b. 1896) |
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| jurgis povilas kairiūkštis RU (b. 1907) |
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| vytautas kairiūkštis Lithuanian composer, LT (b. 1930) |
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| klemensas kairiūkštis LT (b. 1923) |
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| tomas kairiūkštis LT (b. 1925) |
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