Cognomen Oroo (Oroo 
) , worldwide, is a rare last name. The cognomen Oroo is habitual in Kenya, where it is a rare surname, Tanzania, and Peru, where it is a very rare surname. In absolute terms, this name is the most popular in Kenya, Tanzania, and the United States. Very seldom, Oroo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oroo | Kenya, Pakistan, United States, Tanzania, Nigeria |