MINAMOTO no Tsuna was adopted by MINAMOTO no Atsushi of the Ninmyo-Genji, who was the husband of the daughter of MINAMOTO no Mitsunaka of the Seiwa-Genji, settled in his mother's hometown of Watanabe-no-tsu, Settsu Province (present-day Chuo Ward, Osaka City), and used it as his base, taking the name WATANABE no Tsuna (WATANABE Genji) and later becoming the patriarch of the Watanabe clan.
源綱（みなもとの・つな）は、清和源氏の源満仲の娘婿である仁明源氏の源敦の養子となり、母方の里の摂津国渡辺津（現・大阪市中央区(大阪市)）に住み、同地を本拠地として渡辺綱（渡辺源次）と名のり渡辺氏の祖となる。