Cognomen Seraia (Seraia 
, Серая 
) , worldwide, is quite a rare surname. The cognomen Seraia is habitual in Belarus, where it is quite a rare surname, Russia, and Kazakhstan, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Seraia | Australia, South Africa, India, United States, Brazil |
| Серая | Kyrgyzstan, Russia, Belarus, Kazakhstan, Ukraine |