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Cognomen Kogai (Kogai
, Когай
, Когаи
) , all around the world, is quite a rare last name. The surname Kogai is habitual in Kazakhstan, where it is quite a rare surname, Kyrgyzstan, and Azerbaijan. Not in comparison with a country's population, it is the most numerous in Russia, Kazakhstan, and Azerbaijan. Much less frequently, Kogai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kogai | Kazakhstan, Russia, Japan, Israel, Kenya |
| Когай | Kazakhstan, Russia, Tajikistan, Kyrgyzstan, Azerbaijan |
| Когаи | Russia |