Cognomen Síl (Sil 
, Sile 
, Síl) , all around the world, is a widespread last name. The surname Síl is habitual in India, where it is quite a common surname, Latvia, and Guatemala, where it is quite a rare surname. In absolute terms, it is commonest in India, Bangladesh, and Guatemala. Much less frequently, Síl is the forename as well as the last name.