<p>Bryke is the name of the show's creators, not a character name. the Water Tribes are based on the Inuit, so that explains Unalaq and Tornaq. Ozai and Zuko could pass for Japanese names as well and I've heard the FN is inspired by Imperialist Japan, so characters from there having Japanese-inspired names makes sense, though, like someone else said, The Satos and Mako are from the URN, not the FN. I don't know about Varrick or Amon
</p>