Being a linguist and someone with a milliliter of good taste in movies, I'm going to call them on the carpet about "maron" being "nightmare" "in Germanic." There is no such thing as a language called Germanic. It is a language family. English belongs to the Germanic language family. This is the icing on the cake for this travesty of a film.
I watched it on a website that said it was Paranormal Activity, not that I was expecting much from PA anyway.
I know nothing about other languages or anything, but looking it up online produced these results
http://wiki.answers.com/Q/What_is_the_origin_of_the_word_nightmare
Interestingly, the mare in nightmare has nothing to do with a female horse. Instead, it comes from Old English maere 'goblin, incubus.' The word was nigt-mare in 1300, and it referred to an evil female spirit afflicting sleepers with a feeling of suffocation. By 1350, it was nytmare and in 1440 it was nyghte mare. Mare 'goblin' is a cognate with Middle Dutch mare, maer 'incubus,' Old High German mara, Middle High German mar, mare (dialectical modern German Mahr 'nightmlare'), and Old Icelandic mara 'incubus.' Mare comes from the Proto-Germanic word *maron.
Nightmare was used to describe 'a bad dream caused by an incubus' in the 16th century, and by 1829 it was used to describe 'a bad dream' in general.
From: TakeOurWord.Com
Well, Proto-Germanic is a "language" in that words have been traced back to it, but "words" in Proto-Germanic are hypothesized. Etymologists and historical linguists have to work backwards and use comparative linguistics to make educated guesses about what the roots were in the proto-language, so any proto-language is "reconstructed" (which is why you'll find the asterisks before the root words). There is no such language as "Germanic" - Proto-Germanic was the common ancestor for Old German, Middle German, High German, English, etc.
So the movie was ALMOST right, but they made a distinct mistake by not saying "proto-".
Actually it's worse than that. The word Maron could also be referring to a priest by that name or a town where they produced wine in Thrace. I don't think it's a stretch to have an evil dead priest in a movie rather than just a word that is supposedly supposed to mean nightmare, which is actually not really proven. Also on a side note the word Maron could have been a reference to the horse he rode in on being a white mare.
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Why would you think it would be a priest? Is there a famous priest named Maron?
Well, there seemed to be some other evidence this was not human. The footprints on the ceiling for one, are clearly not human.
The foot is similar, but clearly not.
"I'd say this cloud is Cumulo Nimbus."
"Didn't he discover America?"
"Penfold, shush."