Why not, it's your right and privilege to name this child, so if you like it, great. However, I have to agree with another poster that
Gavin Huckleberry does not flow that well in terms of trendiness/uniqueness.
Also... you stated you like
Holden William. If I remember correctly, was there an actor a long time ago by the name of
William Holden?
Huckleberry, to me, is more of a memorable character than a weird name... so I think it works. Then again, I am in love with the name
Atticus and would use it in a heartbeat if my husband allowed it. I don't think there is anything in this world that can stir up great emotion than a really good character novel... and a classic one at that. If it really means that much to you, go for it!