Family name Koika (Койка 
, Koika 
, Коика ) , all around the world, is a rare surname. The surname Koika is habitual in Bulgaria, where it is quite a rare surname, Greece, and Tanzania, where it is a very rare surname. Measured by absolute frequency, it is commonest in Bulgaria, Greece, and Russia. Also, Koika is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Койка | Bulgaria, Kazakhstan, Russia, Ukraine |
| Koika | Russia, Tanzania, India, Greece, United States |
| Коика | Russia |
|
catherine koika Permanent Representative of the Hellenic Republic in Vienna, GR (b. 1959) |
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