Birthday Boy! For the St. Patrick's Birthday Boy! Complete with shamrocks and Irish green font. If you know someone whose birthday falls on March 17, then help them celebrate with a great St. Patrick's Day birthday gift! Customizable, of course. See all our St Patrick's Day birthday tees, caps, hoodies, mugs, born on st patricks day, and all things Irish at Leprechaun Gifts! From Leprechaun Gifts, backed by the Zazzle guarantee.