what is dunys "true name"?

I do not recall a character "duny".

"Duny" is the main character - named by his mother before she died. Le Guin makes note of the fact that the name "Duny" was the only thing that she was able to give to her child.

From page 16: "On the day the boy was thirteen years old, a day in the early splendor of autumn while still the bright leaves are on the trees, Ogion returned to the village from his rovings over Gont Mountain, and the ceremony of Passage was held. The witch took from the boy his name Duny, the name his mother had given him as a baby. Nameless and naked he walked into the cold springs of the Ar where it rises among rocks under the high cliffs. As he entered the water clouds crossed the sun's face and great shadows slid and mingled over the water of the pool about him. He crossed to the far bank, shuddering with cold but walking slow and erect as he should through that icy, living water. As he came to the bank Ogion, waiting, reached out his hand and clasping the boy's arm whispered to him his true name: Ged."