Cognomen Rayu (Rayu 
, Раю 
, Райу ) , in the entire world, is quite a rare surname. The family name Rayu is habitual in Moldova, where it is quite a rare surname, Bulgaria, and Argentina, where it is a rare surname. Measured by absolute frequency, it is commonest in India, Indonesia, and Argentina. Likewise, Rayu is the forename as well as the last name.