We didn't find out sex so had to have names for both, I had said years earlier that I wanted to use my mil maiden name if we had kids. It's a beautiful not too unusual girls name. We had some back up girls names too, but a few weeks before due a friend said she used her back up names for her first dd and regretted it for months so luckily she got another chance to use it. I do love dd name.
For a boys name I went through the name book start to finish and wrote down every name I could live with, then went and crossed some off on reflection. Then dh crossed some off. So we had two names we could use, but in all honesty if dd had been a boy we would have probably been nameless for at least a few hours as we weren't really in love with any boys names.