Last name Koschaeva (Koschaeva, Кощаева 
) , around the globe, is a very rare cognomen. The cognomen Koschaeva is habitual in Kyrgyzstan, where it is a very rare surname, Russia, and Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Кощаева | Kyrgyzstan, Russia, Ukraine |