Some of you probably already know about this site, but I thought it was really interesting. :)
It's the baby name site for the Social Security Administration.
You can see how popular a name has been over the years. For instance, I checked the popularity of Michelle over the last 60 years. My name always made it on the top 1,000 most popular names, but in the 60s and 70s, it was always in the top 10, so it was way big then.
I also checked my middle name, Halley. It only made the top 1,000 in 1986. I got it in 1985, but that's pretty close, and not surprising, because 1985/1986 is when Halley's Comet came back, and it was visible in America in 1986. Interestingly, the different spellings, like Haley, Halle, Hallie, etc. were popular during many different years. So, I just have the uncommon spelling. That makes sense though, because the comment is named after a man named John Halley, so Halley is the last name way to spell it rather than the first name way, like Hallie.
For 2008, Jacob was the most popular boy name and Isabella was the second most popular girl name. Twilight, anyone? :)
Also, Mimi has not made the 1,000 most popular list since the 60s, but it did make it every year before 1967. Well, until 1949 at least. I didn't check back farther than that. So, apparently there aren't a whole lot of legal Mimis running around these days.
Jill hasn't made the list since 2000, so while it's a common name, it doesn't seem to be too popular these days. Good. Maybe Jill will get to be the only Jill in her class at school. Makes things simpler that way. :)