The son of his father [and the son of Kifuk (the version of the Aruch is Kipoz) was turned over, as his peers, that day they did not mourn for Rav Ashi, as it is stated in Makkot (25) and see Yevamot (103), others say the son of Avin]:
Seder_HaDorot,_Tanaim_and_Amoraim.122:1