Originally Posted by Ben Dawson
true, but if that's so then why is he still using that name, especially in Doctor Who when it was well established that he was a conman. Maybe it's a coincidence that they have the same name, maybe they're related. Oh, I don't know, that conman thing is a good point
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We have no idea whether "Jack Harkness" was his real name or not, only that he was using it in the 40s. He may have continued using the name as a matter of convenience, possibly having forgotten his real name after the Time Agents stole his memory. He would then just assume identities as a conman. When he moved to Torchwood, either he continued using the name Jack out of convenience again, or he got used/attatched to the name, or he felt it was one of his last remaining "links" to the Doctor.
Or it could just be his real name
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