The son of Surya was known by the name of Vasushena, but after his cutting off his natural armour, he was called Karna (cutter).
प्राङ्नाम तस्य कथितं वसुषेण इति क्षितौ। को वैकर्तनश्चैव कर्मणा तेन सोऽभवत्॥