They had a list they were going to choose from when he was born. The name Galen wasn't on it, though they'd considered it at some point. Then he did a flip, just to spite the external version she'd had 2 days earlier, and was breech. He was born via c-section instead of at the birthing center. Alex saw all of the doctors everywhere and the name Galen was suddenly the right one. His middle name is Ulysses.