I have a photo of a person, met him on a dating site and he introduce himself as George Nicholas. I don't believe that it is his name and have a positive feeling that this photos were used by another person. I want to know who this person on the photo really is. Is there a way to find that out?

I don't think so, the only way really is webcam or meeting up (but always be careful with that). Anyone can put any name, pic and info or any website.

Even if you could, the photo could be a random photo taken off the Internet and have nothing to do with the perp.

If you were scammed by this person report it to the police.