Namesakes
Fictional Characters from Television:
1 character
Will Gardner 2009 The Good Wife 
Hall-of-Famers:
1 ice hockey
(ice hockey) Jimmy Gardner 1962
Notable Actors and Entertainers:
2 actors
Ava Gardner 1922-1990
Virginia Gardner 1995-
Notable Journalists:
1 journalist
(journalist) Sue Gardner 1967-
Olympic Medalists:
2 gold/silver, 1 bronze, 1 gold/bronze, 1 silver
(silver) Maureen Gardner 1948 80 m hurdles
(bronze) Keith Gardner 1960 4x400 m relay
(gold/bronze) Rulon Gardner 2000; 2004 Greco-Roman wrestling
(gold/silver) Victoria Pendleton (a.k.a. Gardner) 2008; 2012 cycling - track
(gold/silver) English Gardner 2016; 2020 4x100 m relay
Rock and Roll Hall-of-Famers:
1 musician
Carl Gardner 1987 The Coasters
Tolkien's Characters:
14 characters
Bilbo Gardner (m)
Daisy Gardner (f)
Elanor Gardner (f)
Frodo Gardner (m)
Goldilocks Gardner (f)
Hamfast Gardner (m)
Holfast Gardner (m)
Merry Gardner (m)
Pippin Gardner (m)
Primrose Gardner (f)
Robin Gardner (m)
Rose Gardner (f)
Ruby Gardner (f)
Tolman Gardner (m)