Its origin was Asakura, Yabu County, Tajima Province (Yabu City, Hyogo Prefecture), and at first the clan used the name of Kusakabe clan as its sei (authentic surname).
出自は但馬国養父郡朝倉（兵庫県養父市）であり、はじめは日下部氏（くさかべ）を姓とした。