I literally just found out today that I could change my dragons' names for free! For some reason, I thought it cost gold. I went through and changed almost all of them.
Some of my favorites: Giza the Pyramid dragon, Genesis the Fruitful dragon, Strike the Lightning dragon, Colbert the Eagle dragon (after Stephen Colbert), Ricin the Poison dragon, Sochi the Winter Games dragon, Venus the Athletic dragon (Venus Williams), Puff the Magic dragon, S'more the Marshmallow dragon, Sakura the Cherry Blossom dragon, Calla the Lily dragon. Picking names is fun!