All over the world, ประสิทธฺ์ (ประสิทธฺ์ 
) is a very rare male first name. The given name ประสิทธฺ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare masculine name. Very seldom, ประสิทธฺ์ is the last name as well as the forename.