Meaning and name origin
Sly is not a popular first name for males but a very popular surname or last name for all people (#9630 out of 88799, Top 11%) (2000 U.S. Census).
Displayed below is a comparison of the popularity of the boy name Sly and its source form. The only popular variation form ranked in the Top 1000/100 is Sylvester. (2014 statistics).