Tahmineh Names Sohrab's Father

From B8.5, The Birth of Sohrab. It illustrates B8.5.12–19:

B8.5.12
His mother said: “Then hear me and rejoice;Be not too rash, but listen to my voice.
B8.5.13
Your father is great Rostam, battle-tried,The Piltan whose renown spreads far and wide.
B8.5.14
From Dastan, Sahm, and Nariman you spring,Renowned stock fit to stand beside a king.
B8.5.15
Since the World-Creator set the world in frame,No rider yet has matched your father’s fame.
B8.5.16
No peer to Sahm was known beneath the sky;The sphere itself dared not approach so high.”
B8.5.17
She brought the letter Rostam sent of old,Three rubies and three heavy bags of gold.
B8.5.18
“At birth your father gave these gifts to you,With words that proved your noble lineage true.
B8.5.19
Guard these; they prove the lineage you claim,And show that Rostam is your father’s name.”