Family name Seydin (Сейдин 
, Seydin 
) , in all the world, is a rare cognomen. The cognomen Seydin is characteristic of Nicaragua, where it is a rare surname, Honduras, and Kyrgyzstan. Also, Seydin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Сейдин | Kyrgyzstan, Kazakhstan |
| Seydin | Honduras, United States, Nicaragua, Peru |