Let's check what my ol' dad, John Winchester has written about ghouls in his diary:
Ghouls are scavenger creatures that live in graveyards and traditionally feed on the flesh and blood of the dead. Ghouls are not nocturnal, they eat whenever they get the chance. At times ghouls will change their diet and will feed on living humans instead of the dead. Ghouls can also take the form of any person they have eaten, whether the person is still alive or already dead.
The only thing that can kill a ghoul is decapitation or complete destruction of the head. Bashing their brains in works as well.
We have a couple of things to go on. We know Yakman is dead, so if someone walks around yaking it up, it'll be a ghoul. We know that they they live in graveyards.
Now I don't know a damn thing about any of you. Cass isn't here, nor my brother Sam. Heck not even Crowley! We all just woke up together in a graveyard.
But thinking about that, the ghoul(s) decided to take human form and a name. What's odd is that several of them have names with numbers:
aedan777
Euro007
jeray2000
Ironhide G1
Marty99
Chumley1
What has numbers you ask? Tombstones! Date of death to be precise. And tombstones are commonplace here around us Just 1 or even G1 doesn't look like much of a date. 007 is an odd one as well. 777 was long ago so probably nothing to feed on, unless we're dealing with ancient monsters. 99 isn't that specific, however 2000 is.
Vote jeray2000
A ghoul who just decided to go by whatever it read on a tombstone? Unless someone shows up looking like Yakman, I think this is the best I can come up with.