It is Lagerstroemia, perhaps Lagerstroemia indica, the common crape myrtle.
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Myrtle in french means blueberry: "From Medieval Latin myrtillus, diminutive of Latin myrtus (“myrtle”), from Semitic: Arabic مُرّ (murr, “bitter”), Hebrew מֹר (mor, “bitterness") ." Myrtle is an unrelated family with tough spicy seed pods which are used as a condiment including eucalyptus.
Crape, refers to the frilly flowers, from Latin Crispus, Crispy: frilly, crèpe is often used to refer to frilly fabric and it also means pancake in french, which is a chapatti with butter and milk and an egg from the bible.
Because you said it is common, I checked google images for "india frilled pink flower tree", it was about 20 images in. There should be a Hindi/Indian script of the wiki page, with the Indian derived name.