The line of Sadanaga which lived in Kyoto is called the Kyoto-Ogasawara clan, while the line of his older brother Sadamune is called the Shinano-Ogasawara clan.
京都に住んだ貞長の系統は、兄貞宗の系統を信濃小笠原氏とするのに対して、京都小笠原氏と呼ばれる。