PLEASE HELP!!!!

I told my husband that if we ever have a daughter that he could name her after his grandmother ...which I thought he was talking about his dads mom whose name is Vashti Fay ...come to find out he was actually talking about his great grandmother on his moms side whose name was Sunday yes like the day of the week Sunday ..I cant even think of a middle name that goes with that ..and he said I can name our son as long as he could name our daughter if we ever had one I named our son Enzo who is now two ...would I be terrible if I wouldnt let him name our daughter Sunday? or should I be a woman of my word and go with it