The Matsuura Clan, which was known as the leading clan of the naval Matsuura faction in Kitakyushu, also branched off from the Watanabe clan, and its patriarch was WATANABE no Tusna's grandson, Hisashi MATSUURA (also known as MINAMOTO no Hisashi, WATANABE no Hisashi), who went to Kyushu as the Lord (Shokan) of Uno-no-Mikuriya in Matsuura County, Hizen Province, which was under the direct control of the Emperor.
北九州の水軍松浦党の惣領氏として知られる松浦氏もまた渡辺氏から分かれたもので、渡辺綱の子の奈古屋授（源授、渡辺授）の子で、肥前国松浦郡の天皇家直轄の宇野御厨の荘官として九州に下った松浦久（源久、渡辺久）を祖とする。