The best replacement for kalam is pranab.

The best alternatives to kalam are rated as following:
★★★★★  pranab
★★★  cosmological argument
★★  pranab mukherjee

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Speaking about kalam, one probably shouldn't forget about sivakumar.

Other search terms related to kalam and their ratings are:
★★★★★ sivakumar
★★★ noni
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Google Trends

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kalam
pranab
cosmological argument