Worldwide, Ostr (Ost 
, Ostur 
, Ostr 
) is a rare male first name. The first name Ostr is habitual in Austria, where it is a rare male name, Egypt, where it is a very rare male name, and Indonesia. Measured by absolute frequency, it is the most numerous in China, Indonesia, and Egypt. More frequently, Ostr is the last name as well as the forename.