Last name ประจำ (Regular 
, Pracham 
, ประจำ) , across the world, is quite a rare cognomen. The family name ประจำ is habitual in Dominica, where it is quite a common surname, the Dominican Republic, where it is quite a rare surname, and Canada, where it is a rare surname. In absolute terms, this name is the most popular in Philippines, Canada, and the Dominican Republic. Very seldom, ประจำ is the forename as well as the last name.