Cognomen Καΐρης (Kairis 
, Kaires 
, Καΐρης ) , across the world, is quite a rare family name. The last name Καΐρης is characteristic of Latvia, where it is quite a rare surname, Greece, and Belgium. Not in comparison with a country's population, this name is the most popular in the United States, Greece, and Belgium. Very seldom, Καΐρης is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kairis | Germany, Belgium, United States, Latvia, Greece |
| Kaires | Germany, Australia, United States, Brazil, Venezuela |
| Καΐρης | Greece |
|
θεόφιλος καΐρης Priest, revolutionary (1784-1853), GR (b. 1784) |
|
| μιχαήλ καΐρης Greek politician, GR (b. 1790) |
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| αλέξανδρος καΐρης Greek lawyer, GR (b. 1913) |
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