Family name Kulhay (Kulhay 
) , globally, is a very rare surname. The cognomen Kulhay is habitual in Hungary, where it is a rare surname, Austria, and Canada, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Hungary, Austria, and the United States. Very seldom, Kulhay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kulhay | Germany, Austria, Hungary, United States, Canada |