Surname Билий (Bily 
, Biliy 
, Bilij 
) , globally, is quite a common last name. The family name Билий is characteristic of Czechia, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Algeria. Measured by absolute frequency, it is the most numerous in Czechia, France, and Algeria. Likewise, Билий is the forename as well as the last name.