The best replacement for pharrell is timbaland.

The best alternatives to pharrell are rated as following:
★★★★★  timbaland
★★★★★  kanye
★★★  will i am
★★  pharrell
★★  nardwuar
★  lupe fiasco
  northern soul
  arby's

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Speaking about pharrell, one probably shouldn't forget about daft punk.

Other search terms related to pharrell and their ratings are:
★★★★★ daft punk
★★★★ snoop dogg
★★★ stevie wonder
★ robin thicke
★ chad hugo
clipse
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pharrell
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