Compared to the powerful clans who called themselves Omi, who generally used place names for their uji names, such as the Soga clan and Kibi clan and were chiefs who used their area as a base, those who called themselves Muraji had the uji name after the Tomonomiyatsuko who had the names of their official duties as a Tomo, such as the Otomo clan and Mononobe clan.
それは、臣と称する豪族は、蘇我氏・吉備氏など、一般に地名をウジの名とし、それぞれの地域を基盤とする首長であったのに対して、連と称した豪族は、大伴氏・物部氏など、トモとしての職掌を名にもつ伴造のウジとしたのである。