When we found out we were having twins, we started the name game -- first names, middle names, nicknames, etc. We had a matrix with options. It was a never-ending battle.
We checked the Social Security website to make sure we weren't picking one of the top ten names. We didn't want our daughters to have the same name as half their class. Shari was a popular name when I was growing up. I was one of four Shari's on our block. I hated having the same name as so many others.
Here's a fun web site I wish I had known about when we were deciding names -- http://howmanyofme.com/. This site allows you to put in your first and last name. A few seconds later you find out how many other people in the country share your name. It's really fun!