Well you said it was a pleasure planet and there's a large noble pressence. Generally nobles at least know of eachother by their title. Whether they care or respect that person's title is another thing.
Interestingly, there is nothing forbidding an Inquisitor from being a Noble. It would be quite humorous and ironic if the Inquisitor's 'cover' was his real identity. =D
This is ironically the case. The Inquisitor in question is based heavily on a PC in a previous campaign (with a different group), who ended up becoming a noble by marriage, back when he was an Acolyte.