The tree flowers prior to the monsoon season and sheds it's leaves in Winter and regrow them in Spring and Summer.
I have seen three different colours of the flower (growing in my neighbourhood): pink, violet and white.
Place-India, Kolkata, West Bengal. Season - Monsoon.
It is Lagerstroemia, perhaps Lagerstroemia indica, the common crape myrtle.
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.
1$\begingroup$ I found two of them today in south france here, where temperatures reach -15 some years: goo.gl/maps/xM3sFJe5bpC2 $\endgroup$ Jul 22, 2018 at 20:42