Lothar (Cycle of Hatred)

Lothar is an officer in Theramore's army, most likely a colonel as he is mentioned by Duree as the one who should be sent to Northwatch to investigate recent events rather than Colonel Lorena.

Speculation
It is not likely that he is related to Anduin Lothar, seeing as Anduin was said to be the last of his line. Therefore, one would assume that Lothar is a decently common surname in the world of Azeroth. Alternatively, this could also be a first name.