LB: I have 2 friends who each named their seventh child (girls) Batsheva. Probably the most famous one of this generation was Reb. Batsheva Kanievsky A”H.
We generally stay away from creating names (as you asked above Batshmoneh or Benshesh).
A Rav can be approached with any question you have in life. Naming a child is a significant event and the advice of a rov is always welcome.
My wife and I never discussed possible names until she was in labor. We had situations where a close relative was niftar right before she gave birth. All of our children were named as a zechus for a deceased relative.