Hard work naming babies isn't it?
FWIW we only had one name for each sex too. We thought we were going to deliver at 25weeks with Nate and picked the 2 names then - and then never changed them. It seemed so natural to have his name 'ready' when he was born.
With Darcy we had a few and even I was surprised when she was born and they asked her name and with out any consultation Dh said 'Darcy'. lol I love it now though.