Cognomen Ryustem (Ryustem 
) , worldwide, is a rare last name. The family name Ryustem is characteristic of Bulgaria, where it is quite a rare surname, Greece, where it is a very rare surname, and Poland. In absolute terms, the name is most common in Bulgaria, Poland, and Spain. Much less frequently, Ryustem is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ryustem | Germany, Spain, Bulgaria, Poland, Greece |