The best replacement for alka is shreya.

The best alternatives to alka are rated as following:
★★★★★  shreya
★★★★★  anuradha
★★★  lata
★★  kavita
  roshan

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Speaking about alka, one probably shouldn't forget about sathyaprakash.

Other search terms related to alka and their ratings are:
★★★★★ sathyaprakash
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alka
shreya
anuradha