Family name Ouser (Усер 
, Ouser 
) , in the world, is a very rare surname. The last name Ouser is habitual in Kyrgyzstan, where it is a very rare surname, Ukraine, where it is an extremely rare surname, and the United States. In absolute terms, it is the most numerous in China, the United States, and Kyrgyzstan. More frequently, Ouser is the forename as well as the last name.