源氏
The real family name of the clan is Genji (Minamoto clan). It belonged to one of lineages of Seiwa Genji (Minamoto clan), the Shinano Genji (Minamoto clan) that falls into the branch family of Kawachi Genji (Minamoto clan), and it was a branch family of Ogasawara clan. It is said that Miyoshi clan is a branch of the distinguished Ogasawara clan in Shinano Genji. But it is considered that the clan used deceptive name as there are many contradictions in each existing genealogy. The clan is also called Awa Ogasawara clan. The clan moved from Shinano Province into Miyoshi County, Awa Province, where it set its home ground.