Namesakes
Fictional Characters from Song Titles:
1 character
(character) Leonardo 1999 Hey, Leonardo (She Likes Me For Me) 
Notable Actors and Entertainers:
1 actor
Leonardo DiCaprio 1974-
Notable Artists:
1 painter
Leonardo da Vinci 1452-1519
Notable Athletes:
2 soccer, 1 rugby, 1 tennis
(tennis) Julio Peralta (a.k.a. Leonardo) 1981-
(rugby) Leonardo Ghiraldini 1984-
(soccer) Leonardo Bonucci 1987-
(soccer) Jürgen Locadia (a.k.a. Leonardo) 1993-
Notable Musicians:
1 singer
Fedez (a.k.a. Leonardo) 1989-
Notable Philosophers and Thinkers:
1 mathematician
Fibonacci (a.k.a. Leonardo) c. 1170-c. 1250
Notable Scientists and Inventors:
1 inventor
Leonardo da Vinci 1452-1519
Olympic Medalists:
2 gold/silver, 1 bronze, 1 gold/bronze
(bronze) Leonardo Sottani 1996 water polo
(gold/silver) Alvin Harrison (a.k.a. Leonardo) 1996; 2000 4x400 m relay; 400 m
(gold/bronze) Leonardo Gutiérrez 2004; 2008 basketball
(gold/silver) Jefferson Pérez (a.k.a. Leonardo) 1996; 2008 20 km walk
Oscar Award Winners:
1 actor
(actor) Leonardo DiCaprio 2016 The Revenant
Saints:
2 saints
Saint Leonardo of Porto Maurizio 1676-1751
Saint Leonardo Murialdo 1828-1900
Shakespearian Characters:
1 character
Leonardo The Merchant of Venice