Namesakes
Fictional Characters from Song Titles:
1 character
(character) Greg 2008 Go-Getter Greg 
Fictional Characters from Television:
6 characters
Greg Brady 1969; 1990 The Brady Bunch; The Bradys
Greg Medavoy 1993 NYPD Blue
Greg Pratt 1994 ER
Greg Butters 1997 Ally McBeal
Greg Montgomery 1997 Dharma & Greg
Greg Sanders 2000 CSI: Crime Scene Investigation
Hall-of-Famers:
1 baseball
(baseball) Greg Maddux 2014
Nobel Prize Winners:
1 chemistry
(chemistry) Greg Winter 2018
Notable Actors and Entertainers:
6 actors, 1 actor/comedian
Greg Germann 1958-
Greg Kinnear 1963-
Greg Wise 1966-
Greg Grunberg 1966-
Greg Davies 1968-
Greg Vaughan 1973-
Greg Finley 1984-
Notable Athletes:
1 baseball, 1 football, 1 golf, 1 rugby, 1 tennis
(golf) Greg Norman 1955-
(baseball) Greg Maddux 1966-
(tennis) Greg Rusedski 1973-
(rugby) Greg Holmes 1983-
(football) Greg Hardy 1988-
Notable Musicians:
1 musician
Greg K. 1965-
Olympic Medalists:
8 silver, 2 bronze, 2 gold/bronze, 1 bronze/silver, 1 gold
(gold) Greg Bell 1956 long jump
(silver) Greg Buckingham 1968 swimming - 200 m medley
(bronze/silver) Greg Rogers 1968 swimming - 4x100 m freestyle relay; swimming - 4x200 m freestyle relay
(bronze) Greg Brough 1968 swimming - 1500 m freestyle
(silver) Greg Joy 1976 high jump
(silver) Greg Foster 1984 110 m hurdles
(silver) Greg Fasala 1984 swimming - 4x100 m freestyle relay
(silver) Greg Meghoo 1984 4x100 m relay
(silver) Greg Boyer 1988 water polo
(silver) Greg Burgess 1992 swimming - 200 m medley
(bronze) Greg Haughton 1996; 2000 4x400 m relay; 400 m
(gold/bronze) Greg Searle 1992; 1996; 2012 rowing
(gold/bronze) Greg Rutherford 2012; 2016 long jump
(silver) Greg Drummond 2014 curling
Rock and Roll Hall-of-Famers:
2 musicians
Greg Errico 1993 Sly and the Family Stone
Greg Hawkes 2018 The Cars