I agree with the possibility of Lyle begin of Lebanese or Iranian descent. I recall coldcaseman mentioning in one of his posts that Lyle was circumcised, and I think that any man of Lebanese or Iranian descent (born in North America or elsewhere) would be circumcised. I think that the fact that Lyle was circumcised makes it far less likely that he was an immigrant from Europe, unless he was Jewish or Muslim.
I know that where I live (Alberta, Canada), there is a long history of people of Lebanese descent in this province (e.g. Canada's first mosque was built in the 1930's in Edmonton by Lebanese immigrants). I should get around to showing Lyles picture to one of my good friends who is of Lebanese descent whose family has been in Alberta for generations (all of whom speak with very "Canadian" accents). Just need to think of a good way of bringing it up....
I'm also probably looking way too much into this, but I also find it odd that Lyle has a unibrow in his morgue pictures. I believe that coldcaseman also mentioned that he had very little/no hair on his chest (suggesting Lyle may have shaved/waxed his chest). Assuming that Lyle did do that, why wouldn't he get rid of his unibrow too? I'll admit, he was a handsome man who looks to have taken good care of his appearance (even looking to have shaved his face not too long before he hung himself), so I find the unibrow puzzling. Then again, I'm probably looking way too much into it...
Magnum P.E. brings up a good point about family or friends perhaps not wanting to bring it up. If Lyle was of Lebanese or Iranian descent, then there's a good chance of him coming from a Muslim family. Suicide is taboo and a grave sin among Muslims, so I could see Lyle going unclaimed because of his final act.