Family name Ropai (Ropai 
, Ропай 
) , across the world, is a rare cognomen. The family name Ropai is characteristic of Ukraine, where it is a rare surname, Malaysia, and Kazakhstan, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Ukraine, Indonesia, and Russia. Much less frequently, Ropai is the forename as well as the last name.