One website we had quite a bit of fun with while choosing a name for Quinn was the Social Security Administration's historical ranking of the popularity of baby names. Here are the popularities over the past 100 years of some of our names:
Timothy and Laura are clearly baby-boomer names (although neither cracked the top 10), while Jean and Irene are somewhat old-fashioned and have been on the decline for years (the combination Laura Jean didn't crack the top 1000). Quinn, as a name for a girl, is rarer but growing more popular in recent years (Quinn for a boy is more common).
One quibble is that I wish they provided raw numbers of people with each name in addition to rank popularity (since there are considerably more people now than in 1907). Anyway, it's a fun website to play with.