רב אחא סבא

Rab Acha the Elder said: "Taba said to Rav Asi, and he is the son of Rav Mari bar Isur." [In Kiddushin (65b), Mar Zutra and Rav Acha the Elder, sons of Rav Mari, came before Rav Ashi. And in Kiddushin (21a), Zevachim (91a), Menachot (6a), Rav Acha the Elder said to Rav Ashi, and in Bava Kamma, in the chapter "HaMeniach" (and in the first section of the Mishnah). Regarding his burial, see Rashbi. And in Shekalim (34a), Rav Mari bar Rachel, the daughter of Shmuel, his father Isur the Ger, and four brothers, all of them were wise: they are he, and Acha, and Mar Zutra, and Rava.

This is the opinion of Rashi in the chapter "HaShocher." Thus, he erred, for there were three brothers who were the sons of Mari bar Isur: they are Rav Acha the Elder, Mar Zutra, and Rava (and see Yichusin in the name of Rashi in the chapter "HaOmer," but Rava is not mentioned there). And he understood that Mari, and Rav Acha, and Mar Zutra, and Rava are the sons of Isur the Ger.]