Cutie Marks. The mark that supposedly defines who you are. You'll notice in the show that some of the ponies names and cutie marks are similar, like Applejack. Then in some cases the name is completely different from the cutie mark, like Princess Cadence. Why is that? My theory right now is basically one of The Brony Notion's theories: What if Celestia visits the parents of newborns and tell them what they should name their kid, since she has been portrayed to have tons of knowledge about other ponies destinies? But something about that doesn't make sense to me. Let me know what you guys think!