Christian

The name Christian comes from the Greek (and later, Latin) word for Follower of Christ. Although the name is popular for boys in the US and in many other countries, it has been used for girls as well. It had shown a rapid rise in popularity for girls, but has just recently left the top 1000 list of girls' names. As for boys, the name has been a top 100 name for 25 years, but it seems to be stuck in the 20s.

It's interesting to note Christian as yet another example of a name that appeals to traditionalists (specifically Christian ones), as well as to modern parents who like the simplicity of the short version: Chris.

As usual in instances of shortened versions and common nicknames, many parents who prefer the longer name Christian do not like the short version.

2009 Update:
Christian remained at the 23rd spot.

2010 Update:
The name has gone down to the 29ths spot.