Interesting vid (for me, at least): How common are the last names we see in Cinderella Girls?
http://www.nicovideo.jp/watch/sm17292610Text goes like this.
Family Name, First Name (Origin)
Family Name: Nationwide, Ranking
Number of people in the phone book with this family name
Ranking within prefecture of origin (if within top 200)
Prefecture where this name is most common, and its ranking within that prefecture (if within top 200)
For example, Takahashi is the third most common name in Japan.
Reiko is from Kanagawa, and her family name is the third most common there.
Her name appears most in Gunma and Ehime, where it is actually the most common name.
Also, there is exactly one family named Oomyouji and Moroboshi is a name actually used by people (though pretty rare), surprisingly enough. There are, however, no Futamis.