Yeah they're mentioned in the TF2 Comics
Scout is Jeremy
Soldier (is Presumed to be) Jane Doe
Demo is Tavish Finegan Degroot
Heavy is Misha (which is short for Mikhail)
Sniper (as we know so far) is Mr. Mundy
Medic is Ludwig
Spy is Unknown
Pyro is Unknown
and as I said (BLU?) Engineer is Dell Conagher