I am normally against unique spellings of names, but in the case of using Bathsheba, I would change the a to an e, transforming it into "Bethsheba". Bathsheba is not a common name anyway, so sporting a slightly different spelling of it wouldn't cause confusion. I feel this would make the name easier to live with, because bath is not as pleasant to begin your name with (not even mentioning what happened to Bathsheba in the Bible...). Additionally, this version would be like a mix between the Biblical version and the Biblical French & Latin versions.
Please do not use this name. It was an old witches' name for the 1800's. If people were seriously going to name their future daughter that I would be very concerned. Just looking out for thy.
The name is drawn from The Bible where the myth goes that 'Bathsheba' means 'a wife, mother, queen and an object of royal lust (or an object of male gaze)'.