Along with everyone else, yep, Mercia belongs to Bayard. The name of Cenred's kingdom is never mentioned. I've seen people in fic just make something up (one of which was Cenredia which made me lol).
General fanon practice, along with the show, seems to be that Camelot is the name of Uther's kingdom as well as of the castle and town surrounds (I guess if it was in the US they'd call the castle Camelot City, heh). Fanon practice is also that Albion is the new united kingdom. I think the show backs this up in a number of places although I can only remember one: the dragon tells Merlin somewhere in the first season "Without you, Albion will never exist". Or something like that.
They haven't given a name or location for Gwaine's place of origin.
And I have no idea about honorifics. I don't know that Merlin ever addresses any of the other knights with them; Uther and Arthur get "sire" but I don't know about the others. MUST REWATCH, OBVIOUSLY.
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General fanon practice, along with the show, seems to be that Camelot is the name of Uther's kingdom as well as of the castle and town surrounds (I guess if it was in the US they'd call the castle Camelot City, heh). Fanon practice is also that Albion is the new united kingdom. I think the show backs this up in a number of places although I can only remember one: the dragon tells Merlin somewhere in the first season "Without you, Albion will never exist". Or something like that.
They haven't given a name or location for Gwaine's place of origin.
And I have no idea about honorifics. I don't know that Merlin ever addresses any of the other knights with them; Uther and Arthur get "sire" but I don't know about the others. MUST REWATCH, OBVIOUSLY.