i knw why she changed it.when she entered the tinsel town,there were so many actresses with similar names like riya sen, rimi sen ,reema sen...,raima sen...so she decided to have a diff name to avoid confusion...and u knw who suggested her mallika.....Asha bhonsle....and sherawat is her mothers surname..so she changed it to mallika sherawat...i think it sounds better than her original name..
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