'Princess' is how both Moira Bronzebeard in BRD and Theradras in Maraudon are known.
Thaurissan is referred to as 'Emp/Emperor' as well. And we can go on listing. Rivendare is 'Baron' (just like Baron Longshore in Barrens coincidentially), Lashlayer is 'Broodlord'. Or the worst of all that, 'domo, from Majordomo Executus. With 4.2 Firelands, Staghelm also got to earn the same silly nomenclature.
Only notable exceptions are the titled Generals. Drakkisath, Angerforge or Rajaxx.
It has been this way, but why? Does anyone ever talk about Draghi by starting with "ECB Chairman said" ? Probably not.
Why are game names then used like this?
Sheer lazyness, first thing I read, first thing I spout?