The Omi clans generally took their names from the geographic location from which they originated, such as the Soga (蘇我), the Katsuragi (葛城), the Heguri (平群), the Kose (巨勢), the Kasuga (春日), and the Izumo (出雲), thus making them regional chieftains in their own right.
The most powerful Omi added the prefix ō (大, lit. "great") to the Omi title, and were referred to as Ōomi (大臣). Examples of Ōomi mentioned in the Nihon Shoki included Katsuragi no Tsubura (葛城円) during the reign of Emperor Richū, Heguri no Matori (平群馬鳥) during the reign of Emperors Yūryaku and Seinei, Kose no Ohito (許勢男人) during the reign of Emperor Keitai and the four generations of Sogas who dominated the title during the 6th and 7th centuries: Soga no Iname, Soga no Umako, Soga no Emishi and Soga no Iruka.
When the kabane system was reformed into the eight kabane system in 684 following a series of coup attempts, the powerful Omi of the time were given the kabane of Ason, which ranked second under the new system, and Omi itself was dropped to sixth in rank.

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