Not only in Tono City but also all over the Iwate Prefecture, many people use the family name 'Kikuchi' written as 菊池 or 菊地, and according to an oral tradition that in addition to the Tono Kikuchi clan, there was a family that came from Ishinomaki City, Miyagi Prefecture, northing upward along the Kitakami-gawa River.
この他にも岩手県では菊池姓、菊地姓を名乗る人が多く、遠野菊池氏の他にも宮城県石巻市から北上川を北上してきた一族がいたなどの言い伝えが残る。