Worldwide, Oos (Oos 
) is a rare mostly masculine, but seldom feminine first name. The first name Oos is habitual in Indonesia, where it is a rare mostly masculine, but infrequently female name, Egypt, where it is a very rare boy's name, and Pakistan, where it is an extremely rare female name. Not in comparison with a country's population, it is commonest in Indonesia, China, and Egypt. Also, Oos is the last name as well as the forename.