Cessair and Cessair's Heart?

The Saga minipage claims that the organization is called Cessair, so theoretically, all of the members could be called 'Cessair', so Cessair's Heart should be an important person within the organization, possibly a title or a rank.

I'm guessing the grunts used to be called 'unknown men', because we literally did not know where they came from or who they were, but now that we know the organization's name, they're just called Cessair.