What was the name of Karna's brother?

According to the Mahabharata, Karna had a younger brother named Shona (also spelled Shon). Shona was the son of Kunti and Surya (Sun God), born after Karna. Kunti had abandoned him as an infant, and he was raised by a charioteer. Shona fought on the Pandava side in the Kurukshetra war and was known for his skills as a warrior. He was eventually killed in battle.