Surname Slenys (Slenys 
) , in all the world, is a very rare family name. The last name Slenys is habitual in Lithuania, where it is quite a rare surname, Canada, where it is an extremely rare surname, and Venezuela. In absolute terms, this name is the most popular in Lithuania, the United States, and Canada. Very seldom, Slenys is the forename as well as the last name.