any names I have mentioned to my mum up to now have gotten 'oh god no, don't call him/her that!!' with later on .. 'well as long as you don't call him/her xyz' Xyz being the name I said I liked 
They were 'down' on both DS and DDs names during my pregnancies but both now agree they suit them perfectly.
So AIBU to not even drop a little hint ... even though doing so will probably cause endless grumbling from them?!