Deborah is my mums name, so I like it.
It doesn't sound dated to me at all, and I think it would sound lovely on a young girl.
I also know a girl called
Deborah who must be about 8 or so by now. We thought it was a little strange when we first heard her name, because we were so used to hearing on older people. My mum goes by
Debby but I don't think the girl shortens it and almost always goes by
Deborah.
I dislike
Debbie also,
Devorah is nice but it looks a little odd and people would probably just confuse it for
Deborah anyway. I think
Deborah is much nicer.
Both
Deborah's I've know have pronounced it with the three syllables like Deb-a-rah sort of, but I suppose said fast it does sound like
Debra.
Definately go for
Deborah :)