Family name Chilai (Chilai 
, Шилай 
) , across the world, is a rare cognomen. The family name Chilai is habitual in Eastern Europe, particularly Belarus, where it is quite a rare surname, Russia, where it is a very rare surname, and Ukraine. Measured by absolute frequency, it is the most numerous in Belarus, Russia, and India. Likewise, Chilai is the forename as well as the last name.