St. Barbara of Nicomedia is the patroness of the mission.
There is no patron saint of Santa. However, Santa is loosely based on the real life Bishop St. Nicholas of Myra.
There is no specific patron saint of giving, but St. Lawrence is often associated with giving and charity due to his actions in helping the poor and distributing the Church's wealth to those in need. St. Nicholas is also known for his generosity and for being the inspiration behind the figure of Santa Claus.
Saint Barbara
saint barbara
The patron saint of running water is St. John Nepomucene
Saint Philomena (who was a child herself, only 14 when she passed away), and Saint Nicholas (also known as Santa Claus) are patron saints of children.
Saint Anthony's Seminary
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Saint Nicholas, a saint of the Roman Catholic Church, is the original Santa Clause. He lived in Greece a long time ago and is the patron saint of children. That's why Santa is sometimes known as Saint Nick. "Santa Claus" is the Dutch version of Saint Nicholas.
Mission Santa Clara got its name from Saint Clare of Assisi.
This is just a wild guess, but I'd think it would be Santa Clara (Clare of Assisi).
St. Nicholas of Bari. He was the Saint who inspired Santa Claus.