And Jesus asked him, saying, what is thy name?
 &c.] This question was put, not out of ignorance in Christ, but for the sake of those that were with him; and partly, that the miserable condition of this man might be the more known; and partly, that his own power might be the more manifest in the dispossession: 
 and he said, legion, because many devils were entered into him;
 (See Gill on Mark 5:9).