List of Famous people born on December 21st

Gerhard Friedrich "Gerd" Semmer was a German poet, columnist, songwriter and translator. He is considered the "father of the German protest song".

Iljo Keisse is a Belgian racing cyclist, who currently rides for UCI WorldTeam Deceuninck–Quick-Step. Keisse races on the track and on the road, specializing himself until recently in riding six-day races. He notably has won the Six Days of Ghent seven times and reached the podium a total of 12 times.

Gustavo Garcia-Siller, M.Sp.S., is a Mexican-American prelate of the Catholic Church. He currently serves as Archbishop of the Archdiocese of San Antonio, Texas. He previously served as an auxiliary bishop of the Archdiocese of Chicago.

Ervin Johnson Jr. is an American former professional basketball player who is a community ambassador for the Denver Nuggets of the National Basketball Association (NBA). He played in the NBA for the Seattle SuperSonics, Denver Nuggets, Milwaukee Bucks and Minnesota Timberwolves as a center from 1993 to 2006.