I only like
Shiloh on a boy. The sound is quite masculine to me--the
-oh ending is particularly masculine to me.
I do think of the dog, but as I haven't seen the movie or read the book (I've only seen ads for the former), the link isn't prohibitive.
That said,
Shiloh Eleanora and
Shiloh Eliana sound OK. The L sounds are a bit close together for my ears in both combos, though.
Shiloh Rowan and
Shiloh Stephen both sound great, but I slightly prefer
Shiloh Rowan.
Miranda