The name Santa is a girl's name of Spanish, Italian origin meaning "saint". Santa and is often added to lists like Magical Christmas Baby Names and discussed in our forums with posts like "Makeover name game: from one gender to the other".
From the experts:
Santa has an appealing sound, or maybe that's sleigh bells we hear? It's difficult to separate the Italian girls' name Santa from the association to Mr. Claus, king of Christmas. The German diminutive Senta -- or Snow or even Christmas -- might be an easier name to handle.