Surname Kislaia (Кислая 
, Kislaia , Кислаиа ) , across the world, is quite a rare last name. The surname Kislaia is habitual in Belarus, where it is quite a rare surname, Russia, where it is a rare surname, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Кислая | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Кислаиа, Kislaia | Russia |