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As a shortened form of Stephanie, Stefanie, Stephanya, Stefanya, Stephania, Stephanya it's become accepted. But even then it doesn't make sense to me, since the V (sound or letter) doesn't turn up in these names as it does in Steven or Stephen. Steffi would be more intuitive.
Stevie as a full name? No. The only way to escape it and form your own identity would be Eve or Evie, which would cause even more confusion