Cognomen 乌西 (Ousey 
, 乌西) , worldwide, is a rare family name. The family name 乌西 is habitual in New Zealand, where it is a rare surname, the United Kingdom, and Australia. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Australia. Very seldom, 乌西 is the forename as well as the last name.