Mark 5:9

And he asked him, What is thy name? And he saith unto him, My name is Legion; for we are many.

What kind of believers are those who represent Christ as attempting here, by interrogation, to discover the demon's name, in order to be able through such knowledge to cast the demon out? Can they really mean that God in Christ needed to ask anything like that? No. Christ asked THE MAN his name, not because the Lord did not know it, but because he sought thereby to bring the man back to a sense of his own identity, an identity the demon had usurped as shown in the reply.

My name is Legion; for we are many ... The confusion of the singular and plural pronouns here is further indication of the fission which the demon had inflicted upon the man. A legion was four or five thousand men; and, although no truth may be certain in such a reply from such a source, it is at least in harmony with the idea of multiple possessions in some cases, Mary Magdalene being another example (Mark 16:9).