The best replacement for cathy is kathy.

The best alternatives to cathy are rated as following:
★★★★★  kathy
★★  miffy
★  sam
  abby
  catherine
  sam pinto

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Speaking about cathy, one probably shouldn't forget about cathy.

Other search terms related to cathy and their ratings are:
★★★★★ cathy
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Google Trends

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cathy
kathy
miffy