If it is presumed that the Kiso line was the origin of the Misawa clan, the beginning of the Izumo Misawa clan is considered to be Tamenaka MISAWA's entrance into MISAWA and proclamation of MISAWA as his clan's name.
また、木曾系を出自とすると、三沢為仲が三沢に入って三沢氏を称したのが始まりとされる。