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Ezren would be from Glantri. I believe it is mentioned that he is an atheist and it just so happens that so is Glantri other than token honor of Rad.
Harsk would be from Rockhome, Highforge in Karameikos, or Denwarf-Hurgon in Alphatia.
I could see Seoni being from Alphatia. Or for that matter Glantri or Herath or even Karameikos with its College of Magecraft.
Lem would be from the Five Shires.
Kyra might be from Ylaruam or better yet from Thotia on the Isle of Dawn. Or less likely from Nithia in the Hollow World.
Merisiel would be from Alfheim, Glantri, Karameikos, or from Shiye-Lawr in Alphatia.