What was the name of Elisha's servant who tried to get a reward from Naaman?

Answer: Gehazi

Gehazi, Elisha's servant, ran after Naaman to get something from him.

“Gehazi, the servant of Elisha the man of God, said, “Look, my master has spared this Aramean, Naaman, by not accepting what he brought. As surely as the LORD lives, I will run after him and get something from him.””— 2 Kings 5:20 (BSB)