I recently told my GP name to DH and he LOVES it. I think there's a good chance we would use it. If your DH liked it too I would say use it. But he gets to have a say too :-)
I would have to agree with PP go with it as a middle name.. you also gotta remember as he is growing up how he'll pronounce it (most likely it'll sound like 'b*tch') and how others will react to it although as a grown up name it is unique as a child name it can be an easy target for a 'pick on me' name.
Re: GP..damnit name berry
BFP 1- EDD 2/09/11 Missed MC DX @11 weeks D&C- 7/25/10 BFP 2- EDD 12/22/11 Natural MC @ 5w 2d BFP 3- EDD 1/25/12 DD Josephine born 1/16/12