רב אחא בר ביבי

Rab Acha bar Bibi said to Ravina in the name of Rava: "In the matter of Yevamot [(Ch. 8, Mishnah 1)], there is a slight error there, and they did not correct it in the Shas." And it appears that he is a Kohen, for Rav Bibi is the son of Abayi.