There is that, of course, but there's a long tradition of writing fanfic with superficially implausible redheads (e.g. Willow Rosenberg) as lost Weasleys.
Don't forget Bill, incidentally, his job seems to be a cross between merchant banking and Lara Croft tomb raiding, and I suspect needs good reflexes and intelligence.
See my comment above: you name a red-headed character, sooner or later someone will write them as a Weasley. Claudia Donovan is certainly a possibility, though we do appear to know that she has a brother which makes the orphan thing less likely.
How about Donna Noble? Wilfred Mott was a squib born to a Mott father and Weasley mother (an aunt of Arthur's) and knows about the wizarding world, but neither his daughter nor granddaughter showed signs of magical ability - until now, after exposure to the Doctor, Donna starts exhibiting accidental magic far later in life than usual.
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Don't forget Bill, incidentally, his job seems to be a cross between merchant banking and Lara Croft tomb raiding, and I suspect needs good reflexes and intelligence.
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