Last name Pej (ប៉ី 
, 佩吉 
, Pej 
) , worldwide, is quite a rare surname. The cognomen Pej is habitual in Cambodia, where it is quite a rare surname, Hungary, and Denmark, where it is a rare surname. Measured by absolute frequency, it is commonest in Cambodia, Hungary, and China. Also, Pej is the forename as well as the last name.