No doubt, but those come from a name dictionary. What I mean is, has it ever been romanized in the novels? Was furigana ever accompanying the kanji? Did it ever get spelled out in kana? Any of those would give away the reading of her name. if the name has ONLY appeared in kanji, then yes, we're out of luck. I saved her as Yuri for now, because that's the kind of person I am.
Now you're applying the two rules of yuri fans: 1. If an image contains two or more girls, they're lesbian lovers. 2. If it contains one girl, her lesbian lover is taking the picture.