I decided to look up Brielle and saw that it's a short form of Gabrielle. I hate Gabrielle because of the "gab" sound, so it makes sense that while I hate Gabrielle I like Brielle.
Yeah, the part of me that dislikes nicknames as full names makes me want to like Gabrielle more but like you, I dislike the 'Gab' sound. Brielle is much better IMO :)