The derivative clan was not merely limited to court nobility but also included a large number of samurai families that had influence mainly in Kanto, Hokuriku and Tohoku, claiming to be descended from the Northern House--such as the FUJIWARA no Michikane-Utsunomiya clan, the Oda clan, the FUJIWARA no Nagaie-Nasu clan, the Uesugi clan of the Kajuji group, the Fujiwara-Yamakage-Date clan, the FUJIWARA no Toshihito-Saito clan, the Kato clan, the FUJIWARA no Hidesato-Oshu Fujiwara clan, the Ashikaga clan (the Fujiwara clan), the Oyama clan, the Yuki clan, the Sano clan and the Onosaki clan.
派生氏族は公家ばかりではなく、藤原道兼宇都宮氏・小田氏、藤原長家那須氏、勧修寺流上杉氏、藤原山蔭伊達氏、藤原利仁斎藤氏・加藤氏、藤原秀郷奥州藤原氏・足利氏(藤原氏)・小山氏・結城氏・佐野氏・小野崎氏など、主に関東・北陸・東北を中心に活躍した多数の武家が藤原北家の末裔と称した。