I never like the term Zamorian either and preferred Zamoran, but if REH stated it..so be it I guess. Darfari, Pelistim, Cimmerian, Wazuli, etc. are examples where REH didn't find it that important to have consistency..I probably wouldn't hold it against anyone who wrote a scenario that called them any of the following:
Zamoran
Zamorian
Zamori
Zamorean
Zamorite
Zamor
jh