This study investigated the family names of gakkge (musician families) and the status of appointment of each family name as recorded in the Appointment to the Chamber of Music (Gakuso Boin) in order to investigate important elements of Gagaku (Japanese Court Music). In addition, this study retraced the line of each family name. The Appointment to the Chamber of Music is a document that records the gakunin (musicians) who were appointed to the Chamber during a 153-year period between the late ancient era and the early Middle Ages. A total of 25 musician family names appear in this book. Of these families, five were most often appointed to gakuso (the Chamber of Music): Koma, Ono, Ogami, Toyohara, and Abe. In particular, the Koma line represents almost 30% of the people appointed, indicating that they were the most prestigious gakkge. In addition, of the 25 family names in the Appointment to the Chamber of Music, 22 were also recorded in the Newly Compiled Record of Clan Names (Shinsenshoujiroku). Of these 22 names, four are classified as originating from the Korean Peninsula line: Toyohara, Koma, Kudara, and Miyake. In turn, these names were further subdivided into 11 related family names: Toyohara was divided into Toyoharatsurane; Koma was divided into Komanoobito, Komanomiyasuko, Komasomebe, and Komahito; Kudara was divided into Kudaraason, Kudarako, Kudarao, Kudaraki, and Kudarauji; and Miyake was divided into Miyaketsurane. In a similar way, the Japanese Aak world has experienced repeated succession and severance of member families as a result of various social and political changes. The institutionalization of so-called Sanpogakuso defended gagaku during the ups and downs of succession and severance, and a large number of Sanpogakunin in Sanpogakuso were musicians with a Korean Peninsula line family name. In the modern era, since 1873, as gagaku was opened to people other than gakkge, and the system of transmission was no longer based on hereditary succession, musicians appeared who did not hail from a musician family, such as Horikawa Hisatami. As a result, gakunin who do not descend from gakkge have represented approximately half of the 26 gakunin in the Board of the Ceremonies of the Imperial Household Agency. Nonetheless, gakunin, including Ue Sanemichi, whose origins are in the Korean Peninsula, have remained active in the Japanese Aak world to the present day.