Surname Кайрис (Kairis 
, Kairys 
, Kayris 
) , in the world, is quite a rare cognomen. The surname Кайрис is characteristic of Lithuania, where it is quite a common surname, Latvia, where it is quite a rare surname, and Greece. Not in comparison with a country's population, it is the most numerous in Lithuania, the United States, and Greece. Much less frequently, Кайрис is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kairis | Greece, Germany, Lithuania, United States, Belgium |
| Kairys | Germany, Lithuania, United Kingdom, United States, Australia |
| Kayris | Brazil, France, Bulgaria, United States, Venezuela |
| Кайрис | Russia, Kazakhstan, Ukraine, Kyrgyzstan, Belarus |
|
кайрис стяпонас Lithuanian politician (1879-1964), LT (b. 1878) |
|
|
юргис кайрис Lithuanian air racer, LT (b. 1952) |
|
| ксаверас костович кайрис LV (b. 1909) |
|
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кайрис, дональдас Lithuanian basketball player, LT (b. 1977) |
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