Well, uh, I mean, she christened herself "Teresa" so I don't really think it's wrong; just that the pages should be merged. For instance, "Teresa Teng" is autocorrected to this page, but none of the other spellings are.
Don't worry. She's definitely No.1 singer in east Asia. Almost every Chinese and Japanese knows her, meanwhile not everyone in China and Japan knows last.fm -- I'm from China, I knew and registered last.fm today. I seldom listen to music online, I prefer CD.