Its origin is said to be either a family of the Hatano clan, a descendant of FUJIWARA no Hidesato or a Gokenin (an immediate vassal of the shogunate in the Kamakura and Muromachi through Edo periods)in Sagami Province, and in fact, they had several family trees and there is no accepted theory about it.
出自については、藤原秀郷の末裔波多野氏の一族であるとも相模国の御家人の出とも言われ、実際系図が何通りもあり定説化されていない。