Rav Aha Bar Rav was a talmid-haver of Ravina (6th generation of amoraïm), and also a contenporary of Ravina II (7th) (source).
So it's seems that Rav Aha is not the son of Rav (ie Rabbi Abba bar Aybo, who was in 1st).
So, who is this "Rav" ?
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