Namesakes
Fictional Characters from Books:
1 hero
Percy Jackson 2005 The Lightning Thief 
Grammy Award Winners:
1 record of the year
(record of the year) Percy Faith 1961 Theme from A Summer Place
Hall-of-Famers:
1 ice hockey
(ice hockey) Percy LeSueur 1961
Harry Potter Characters:
1 character
Percy Weasley
Nobel Prize Winners:
1 physics
(physics) Percy Williams Bridgman 1946
Notable Actors and Entertainers:
2 actors
Carleton Hobbs (middle name Percy) 1898-1978
Sylvester McCoy (a.k.a. Percy) 1943-
Notable Musicians:
2 singers, 1 composer
Percy Grainger 1882-1961
Percy Sledge 1940-2015
Percy "Master P" Miller 1967-
Notable Scientists and Inventors:
1 physicist
Percy Williams Bridgman 1882-1961
Notable Writers:
1 author, 1 poet
Percy Bysshe Shelley 1792-1822
P. H. Newby (a.k.a. Percy) 1918-1997
Olympic Medalists:
3 bronze, 2 gold, 1 silver
(bronze) Percy Courtman 1912 swimming
(gold) Percy Hodge 1920 3000 m steeplechase
(bronze) Percy Peter 1920 swimming - 4x200 m freestyle relay
(bronze) Percy Wyld 1928 cycling - track
(gold) Percy Williams 1928 100 m; 200 m
(silver) Percy Beard 1932 110 m hurdles
Rock and Roll Hall-of-Famers:
1 musician
Percy Sledge 2005