Surname Karahka (Karahka 
) , in the world, is an extremely rare cognomen. The last name Karahka is habitual in Finland, where it is a very rare surname, and Canada, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Karahka | Finland, Canada |
| helvi karahka Finnish journalist, FI (b. 1912) |
|