'Halfbreed' or 'Anachronism'?

Currently I am debating between two names for my short film. I originally named my short film 'Halfbreed' due to the nickname given to one of the protagonists, Sienna as well as the fact that it portrays the story of the two protagonists: Melodie, a nymph in the modern world and Sienna, a half nymph half human who causes bedlam in the forest kingdom of the nymphs. An example that explains the word 'halfbreed' in a modern film is the word 'mudblood' from J.K.Rowling's Harry Potter series. A 'mudblood' is a wizard/witch born to normal parents and this has similarities to Sienna as only one of her parents was a nymph.

However, the other title I am considering is 'Anachronism'. The word anachronism means a thing a thing belonging or appropriate to a period other than that in which it exists, especially a thing that is conspicuously old-fashioned. This fits the idea of the nymphs perfectly as they are from a time long forgotten (all information about this can be found on my blog post here) but are still part of modern culture. This would be very apt for my film because it could either represent how the nymphs are out of place in the modern world or that Sienna is out of place in the Woodland Realm.