Nicknames:
Den, Denny.
Famous people named Dennis:
Actors Dennis Quaid, Dennis Hopper, Dennis Franz, and Dennis Christopher; comedian Dennis Miller; U.S. Congressman Dennis Kucinich; Nobel Prize winner Dennis Gabor; basketball player Dennis Rodman.
Fun fact:
The name will always be synonymous with the lovable-but-mischievous Dennis Mitchell of "Dennis the Menace" fame.
More Inspiration:
Dashing D Names For Baby Boys, Double The Fun: Boy Names With Double Letters, Terrific Two-Syllable Boy Names,