He has his "official" name - which is the name we give to all sanctuary bred dragons, way of tracking hatching origin if he's transferred. Not sure why I'm explaining that to you! But others might read and wonder what it means.
His official name is Taranis - after the Celtic God of Thunder.
But we just call him Tam. Which...doesn't make sense, it should be Tar. Or Tan, at the very least. But hey, it stuck and he seems to respond to it.