Cognomen Lÿ (Lÿ 
) , throughout the world, is quite a rare family name. The family name Lÿ is habitual in Algeria, where it is quite a rare surname, Libya, where it is a rare surname, and Myanmar. Measured by absolute frequency, it is commonest in Algeria, Myanmar, and Egypt. Likewise, Lÿ is the forename as well as the last name.