It is considered that the Nakagawa clan (represented by Kiyohide NAKAGAWA) in Settsu Province, which became eminent in the Sengoku period (period of warring states), had traced its lineage to this Ishikawa clan (There is also another theory that it descended from Tada-Genji (Minamoto clan), which was related to the family).
戦国時代(日本)の摂津国の中川氏（中川清秀など）は、この石川氏の系統だとされる（親族の多田源氏の系統の説もある）。