So if this is right, Fish Girl’s real name is Matsuri Hyou. Current speculations involve “hyou” meaning ice (because she’s the Maiden of Winter, you see) and/or the “nun” Phoenician character looking like a “water” (冫) radical that’s part of hyou/ice, and which can itself be called hyou. Maybe it’s all of them and we’re being trolled again! The actual character nun stands for “fish,” hence “Fish Girl.”
More on this as it develops.