Jundist is from Jund, a term come settlement but also means unit as military unit and supporter/backers, in few words, the Jundist means the backbone of bureaucrats, military men/explorer/adventurer who were the backbone of the Ummayd power, you could use Courtier/peerage of the ummayds in a way. Several were also native syrians who convert and that have an axe to grind against the romans/ERE,