The best replacement for astaire is kelly.

The best alternatives to astaire are rated as following:
★★★★★  kelly
★★★★  gene kelly
★★★  simpson
★  arthur murray
★  jergens
  ginger rogers
  gene kelley
  lehman

Your alternative for astaire is not listed? Suggest!
Speaking about astaire, one probably shouldn't forget about ginger rogers.

Other search terms related to astaire and their ratings are:
★★★★★ ginger rogers
★ top hat
★ eleanor powell
★ rita hayworth
★ gene kelly
★ robyn smith
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Google Trends

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astaire
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