Meaning:
Its source is William, an English name meaning "Determined protector."
Popularity:
The name Willy ranked 1001st in popularity for males of all ages in a sample of the 1990 US Census.
Though this name appears on the 1990 U.S. Census lists, it is used by only a small percentage of the general population.
Narrative:
This name is also a nickname for other names beginning Wil-, including Wilfred and Willard.