The following saints are memorialized on December 20:
Ammon of Alexandria
Attala of Strasbourg
Bajulus of Rome
Dominic of Brescia
Dominic of Silos
Eugene
Flachanan
Hoger of Hamburg-Bremen
Ignatius of Huleklosteret
Ingen of Alexandria
Julius of Gelduba
Liberatus of Rome
Macarius
Malou
Mikael Piaszczynski
Peter de la Cadireta
Peter Massalenus
Phero Truong Van Thi
Philogonius of Antioch
Ptolomy of Alexandria
Theophilis of Alexandria
Ursicinus of Cahors
Ursicinus of Saint-Ursanne
Vincent Romano
Zeno of Alexandria
There are nearly 20 saints per day with feast days in December so you need to narrow things down a bit.
December 20 1993
His birthday is on December 20, 1982.
No, it is not possible. You have at least 2 patron saints - the saint for whom you are named and the saint/saints who have their feast day on your date of birth. There are about 20 saints or more who have feast days every day of the year.
December 20, 1990
April 20, 1586Rose of Lima
Saint Rose of Lima was born on April 20, 1586.
He was born on December 20, 1964.
December 20, 1989
Tony was born on December 20, 1980.
Saukrates was born on December 20, 1977.
Tony was born on December 20, 1980.