Palawa Joko's name is appearing in Bjora Marches possibly due to Defeat the patrolling xxx events.
I have already encounterd this situation for three time, all happened near a patrolling event:
Two times on Defeat the patrolling Sons of Svanir and another time on Defeat the patrolling Fallen.
Image of the bug during Defeat the patrolling Sons of Svanir event (Joko's green name in the upper center of the pic):
Image after the event expired (Palawa Joko's name is gone):