I was curious myself while at tourney, so I checked it out by : Lobby / Requests / FindTeamPokerStars Player /
when I clicked on his online name it showed the Private tourney I was in. It was the 'Real' McEvoy.
But Shabi makes a valid point, don't think PS would allow anyone duplicate his name or his icon.
Also found some other tidbit of information. Seems Mr. Tom McEvoy will join any tourney as a guest/player, so long as someone stakes him.
*Chat from the tourney I was in, while an observer friend of mine invited Tom to his $8+R private tourney, which was to be held later that night.*
Billyboy62: tom lynx sent you money and password so you can play the 8r1+1
MrLynX [observer]: tom
MrLynX [observer]: get in the rebuy already
Tom McEvoy: ok Lynx all registered
MrLynX [observer]: good
MrLynX [observer]: GL
Below are 2 attachments from both tournies Tom was in. Hope this is proof enough.