i put caroline into the name mapper on the baby name wizard website, which shows the popularity of names that are in the top 100 in each state. i figured since it's such a classic and common name, it would be all over the place.
instead, the entire left side (basically anything west of tx) and some of the northern states are totally blank. it was #22 in south carolina in 2004 but apparently is still less common in a huge portion of the country. really weird, i never thought of it as a 'southern' name.
here's the link: