I was always under the impression that her family name was Ibaraki Kasen.

http://en.touhouwiki.net/wiki/Kasen

It is. The tags just haven't been updated here.

EDIT: This is the same concept as Seiga Kaku and Seiga Nyan-Nyan. Kasen's full name is Kasen Ibaraki and her hermit name is Ibarakasen/Ibaraka-sen.

Touy said:
http://en.touhouwiki.net/wiki/Kasen

It is. The tags just haven't been updated here.

EDIT: This is the same concept as Seiga Kaku and Seiga Nyan-Nyan. Kasen's full name is Kasen Ibaraki and her hermit name is Ibarakasen/Ibaraka-sen.

Oh, I recall she was referred to as Kasen Ibara last time I visited Touhou wiki. Glad to see that rectified. I didn't know Ibarakasen was Kasen's hermit name though.

OBJECTION!