isn't Ethan Rom an anagram?
Other Man (he is/was one of The Others, right?)
More Than... (like everyone else, there's more to Ethan than what we know...)
Another M (M as in Mystery, another mystery...)
Monthera (like Mothra, only a different sort of monster)
I dunno... just thought his name was weird but purposefully weird, as it is some sort of anagram or clue, to.. something...