Guria bar Chama and Rava would bless on Saturday night for his light that was near his house [(Berakhot 53b)]. And the sign is the son of this one, as the name of his father is this one [(for Guria is the son of Chama bar Guria and is named after his grandfather)].
Seder_HaDorot,_Tanaim_and_Amoraim.842:1