Surname Ylys (Илис 
, Ylys 
) , all around the world, is a very rare cognomen. The family name Ylys is characteristic of Kyrgyzstan, where it is a rare surname, Venezuela, where it is a very rare surname, and Argentina, where it is an extremely rare surname. In absolute terms, it is the most numerous in Kyrgyzstan, Venezuela, and Russia. More frequently, Ylys is the forename as well as the last name.