Surname Yly (Yly 
, Или 
) , in the world, is a rare cognomen. The last name Yly is habitual in Kazakhstan, where it is a rare surname, Afghanistan, and Kyrgyzstan, where it is a very rare surname. Measured by absolute frequency, the name is most common in Afghanistan, Kazakhstan, and China. Likewise, Yly is the forename as well as the last name.