Okinaga adopted the sixth son of Tadaoki (Yoriyuki HOSOKAWA) as an heir and was given the surname of Nagaoka, another surname of Hosokawa, and assumed the name of Nagaoka-Sado-no-kami.
興長は、忠興の六男（細川寄之）を養嗣子に迎え、細川別姓である長岡姓を賜り、長岡佐渡守と称した。