Coulson: Do you know what that means Mr Stark?
Iron man: It means someone really wanted to spell dragon

What went through the scientists' mind when they were naming it?
"Ladies and gentlemen, we're naming the entities that are attacking us as D.R.A.G.O.Ns. That may sound like dragons as in the dragon in fantasy settings but that's just totally a coincidence. We're totally not naming them after dragons at all."