Cognomen Керстан (Kerstan 
, Керстан 
) , in all the world, is quite a rare surname. The last name Керстан is characteristic of Germany, where it is quite a rare surname, Austria, where it is a rare surname, and Finland. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Austria. Much less frequently, Керстан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kerstan | Germany, Austria, Spain, United States, Poland |
| Керстан | Kazakhstan, Russia, Ukraine |