The best replacement for kahn is buffon.

The best alternatives to kahn are rated as following:
★★★★★  buffon
★★★★★  darkseid
★★★★  lehmann
★★★  casillas
★★★  overfinch
★★★  onaga
★★  gary mitchell
★★  bison
★★  molina
★★  kahn
★★  schmeichel
★  m bison
★  malignaggi
★  iker casillas

Your alternative for kahn is not listed? Suggest!
Speaking about kahn, one probably shouldn't forget about grover.

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

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kahn
buffon
darkseid