Family name Коика (Koyka 
, Коика 
) , in the world, is a very rare cognomen. The last name Коика is characteristic of Greece, where it is a rare surname, Bulgaria, and Germany, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Germany, Greece, and Russia. Very seldom, Коика is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koyka | Germany, Spain, Bulgaria, India, Greece |
| Коика | Russia |