I love [name_u]Darragh[/name_u].
I like both the look and the sound of it.
As far as etymology goes, behind the name is the more reliable source. This is a lovely name and I love how it sounds. Depending on where you live the pronunciation vs. spelling could be tricky for people and lead to a lot of correction, which is worth taking into consideration, but I also think it’s a name worth using if you really love it.
I love the way it looks and I want to love it because I have a soft spot for Irish names, but the only person I know with this name (spelled [name_f]Darra[/name_f] but pronounced the same) is a woman, so it sounds feminine to me.