When Shuntetsu went on an expedition as a vice-shogun (SAKANOUE no Tamuramaro being shogun) to Hitakami Province, some members of the Kudaranokonikishi Clan or their relatives settled down in the Kitagami Basin, and therefore those who have Kudara as their last names are still seen in southern parts of Iwate Prefecture.
なお、俊哲が坂上田村麻呂の副将軍として日高見国へ遠征したことから、百済王氏の一部かその縁者が北上盆地に定住し、岩手県南部各地に現在でも百済姓を名乗る者が散見される。