Dang. Though you are often…whatever… ; )
That is gorgeous.
Neko Case.
Can’t believe I left her off my original list.
Adele
I think you might misunderstand what an octave is.
No, you could not sing eight octaves. A piano covers less than eight octaves. I am certain you could never sing higher and lower than a piano. 
Most people have a lot of trouble singing the Star Spangled Banner. It has a range of only an octave and a half.
The link gives the vocal ranges for many modern singers. The greatest range was less than 6 octaves.
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Whoever is spinning on my turntable is my favorite … for today! In a pinch my gut answer would be Ella. It’s a shame you rule out the female artists of Grand Opera. The People’s Diva Renee Fleming has lent her vocal gift to genres well beyond the opera stage. She’s not the only diva to do so.
I encourage you to open your horizons just a bit. You are selling yourself short IMO assuming the world class singers of opera only do Wagner. Just not so.
Yet, back in the early sixties it was widely claimed to be ten octaves, even on liner notes on one of her albums. I guess it may have been fabricated to generated extra buzz about her, but my sixth grade teacher, Mr. Riddle, brought that album to class one day, played it for us, told us about her ten octave range, and sure enough, that’s what the liner said. .
I think the real question is was she really Amy Camus… . . .
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Ann Wilson
Neko Case
Alison Krauss
A question with lot of answers , genre , style . I’m a Joni fan but I don’t her voice gets her there.
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Billy Holiday. Won’t win on range but sure can set the mood.
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No. She wasn’t.
Yes, she wasn’t. Some aspects of her autobiographical info were likely BS though.
Range is not a good indicator of greatness.
Judee Sill