I suppose we'll find out at a later date. An interesting anomaly is that the decor would seem to suggest the '70s, but if Jack saw him even as early as his internship, that couldn't have been more than 15 years ago. So either Lost is not set in 2005 or the inferrence that he's been down there since the '70s is incorrect.

Actually, we do have a name for him: Desmond.