"Alexandra, Alexandra..." :) (there's a song like that)
And what difference does it make to you: Mephala or Mefala? In different editions and in different translations, the names and titles of cities and creatures sound different, but I've long gotten used to it and don't pay attention to it. For example, I was surprised when I learned from the Complete Collection that some hero is actually... a heroine! :D So what? We're not going to marry them, are we?! :D
By the way, regarding Sanya and Alexandra. It seems that Sanya is a male version of Alexander, but I've never heard of women being called Sanya. Sasha is another matter, but... Sanya... the authors have a good imagination.