Surname Койкин (Койкин 
) , throughout the world, is a very rare last name. The cognomen Койкин is habitual in Kazakhstan, where it is a very rare surname, Kyrgyzstan, and Russia, where it is an extremely rare surname. Also, Койкин is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Койкин | Kazakhstan, Russia, Kyrgyzstan |