He went to find Hassan.
Rahim Khan went to find Hassan in Hazarjat, who was living in Baba's old house with his son Sohrab.
In "The Kite Runner," Rahim Khan got the scar on his face during a fight with a man who attacked him with a knife while he was trying to protect Amir from harm. The scar serves as a reminder of the incident and the lengths Rahim Khan was willing to go to in order to protect those he cared about.
Killer Khan goes by Killer Khan.
Shakib Khan goes by Masud Rana, and King Khan.
Ike Khan goes by Ike.
Mehran Khan goes by MK.
Nazia Khan goes by Naz.
Nissar Khan goes by Nissar.
Rafick Khan goes by Rah.
Saifullah Khan goes by saifi.
Timothy Khan goes by Hollywood.
Zuher Khan goes by Z.
Iktidar Khan goes by Ikti.