The name Diablo is a girl's name of Spanish origin meaning "devil". Diablo and is often added to lists like Best One-of-a-Kind Names for Girls and discussed in our forums with posts like "Picky Parents BNG".
From the experts:
Diablo Cody, self-named (she's really Brook Busey) screenwriter of Juno, singlehandedly helped popularize not just her heroine's name and her own but all o-ending names for girls. You don't need us to tell you that it takes a brave parent, in every way, to name a baby Diablo. Diablo is one of the Spanish baby names that diverges furthest from the well-paved camino.