I would love to meet the Rebbe or Morah with the courage to teach it that way. I know I'm about 0 for 5 so far with my kids.
However, the first comment by Anonymous offers a plausible לימוד זכות. Perhaps Bisyah is an Egyptian form of the name and once she converted, it became Basyah which is more of a Hebrew form. The problem is, was this really her given name? It's hard to imagine פרעה would name his daughter such. It's more likely this was a name given to her only after she converted.