Across the world, Койка (Койка 
, Kooi 
, Koyka 
) is a rare largely female, but seldom boy's first name. The forename Койка is habitual in Bulgaria, where it is quite a common female name, Malaysia, where it is a rare gender-neutral name, and the United Kingdom, where it is a very rare epicene name. In absolute terms, the name is most common in Bulgaria, Malaysia, and China. More frequently, Койка is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Койка | Ukraine, Russia, Bulgaria, Kazakhstan |
| Kooi | Malaysia, China, Netherlands, United States, Taiwan |
| Koyka | Germany, Bulgaria, Greece, India, Russia |
| Koika | Greece, India, United States, Tanzania, Russia |