Last name Fainstain (Fainstain 
) , all around the world, is a very rare cognomen. The surname Fainstain is characteristic of Argentina, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Fainstain | United States, Argentina |
| edouard elias fainstain (1900-1955) (b. 1900) |
|