What is the name of this insect?
This is a treehopper (an insect in the family Membracidae).
As Arthur J Frost mentioned in his comment above, it will be difficult to ID this specimen more specifically given the angle, lack of further info, and my personal lack of knowledge of Indian fauna.
However, you can view an at-least similar looking species by viewing Oxyrachis tarandus, which is found in India (see here and Sharma &amp; Pati (2011)1).
You can find photos of O. tarandus here, with one copied below for reference.

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 1. Sharma, A. and Pati, P.K., 2011. First report of Withania somnifera (L.) Dunal, as a new host of cowbug (Oxyrachis tarandus, Fab.) in plains of Punjab, northern India. World Applied Sciences Journal, 14(9), pp.1344-1346.