Last name Koopaei (Koopaei 
) , in all the world, is a very rare family name. The cognomen Koopaei is characteristic of Iran, where it is a very rare surname, Canada, where it is an extremely rare surname, and Germany. Measured by absolute frequency, the name is most common in Iran, the United States, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Koopaei | Canada, Iran, United States, Germany |