Family name Мастбаум (Мастбаум 
, Mastbaum 
) , all around the world, is a rare surname. The family name Мастбаум is characteristic of Israel, where it is a rare surname, Portugal, and the United States, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Мастбаум | Russia, Ukraine |
| Mastbaum | Portugal, Israel, United States, France, Brazil |