Namesakes
Notable Actors and Entertainers:
1 actor, 1 actor/comedian
Sandy Dennis 1937-1992 
Gabrielle Dennis 1978-
Olympic Medalists:
1 gold, 1 silver
(gold) Clare Dennis 1932 swimming - 200 m breaststroke
(silver) Rohan Dennis 2012 cycling - track
Oscar Award Winners:
1 actress
(actress) Sandy Dennis 1967 Who's Afraid of Virginia Woolf?