The man said this because Jesus had already told the evil spirit to come out of him.
Jesus told the evil spirit, “Be quiet and come out of the man!”
He shouted, “Jesus, Son of God in heaven, what do you want with me? Promise me in God's name that you won't torture me!”
Jesus asked, “What is your name?” The man answered, “My name is Lots, because I have ‘lots’ of evil spirits.”
This went on for several days. Finally, Paul got so upset that he turned and said to the spirit, “In the name of Jesus Christ, I order you to leave this girl alone!” At once the evil spirit left her.