Cognomen Pachayan (Pachayan 
) , globally, is a very rare surname. The family name Pachayan is habitual in Lebanon, where it is a rare surname, France, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Lebanon, France, and India. Also, Pachayan is the forename as well as the last name.