Namesakes
American Presidents:
1 president
Zachary Taylor 1849-1850 
Biblical Characters:
1 character
Zechariah (a.k.a. Zachary) (m) Luke 1:5
Bishops of Rome and the Popes:
1 pope
Zachary 741-752
Fictional Characters from Books:
1 character
Zach Dempsey 2007 Thirteen Reasons Why
Fictional Characters from Television:
6 characters
Zack Morris 1987; 1989 Good Morning, Miss Bliss; Saved by the Bell
Zack Nichols 2001 Law & Order: Criminal Intent
Zach Young 2004 Desperate Housewives
Zack Addy 2005 Bones
Zach Florrick 2009 The Good Wife
Zach Dempsey 2017 13 Reasons Why
Hall-of-Famers:
1 football
(football) Zach Thomas 2023
Notable Actors and Entertainers:
6 actors, 1 youtuber
Zach Galifianakis 1969-
Zach Braff 1975-
Zachary Quinto 1977-
Zach Gilford 1982-
Zach Roerig 1985-
Zac Efron 1987-
Zach King 1990-
Notable Athletes:
1 rugby
(rugby) Zack Test 1989-
Notable Filmmakers:
1 director
Zack Snyder 1966-
Notable Musicians:
2 musicians
Timothy "Timbaland" Mosley (a.k.a. Zachary) 1972-
Zac Hanson 1985-
Olympic Medalists:
1 gold, 1 gold/silver
(gold) Zac Zorn 1968 swimming - 4x100 m freestyle relay
(gold/silver) Zac Purchase 2008; 2012 rowing
Saints:
3 saints
Saint Zechariah (a.k.a. Zachary) ?-0xx
Saint Zachary ?-106
Saint Zachary 679-752