when I mistook this thread for Helena's devanagari thread is that in different parts of India I think the name would have slight variations on how it would be written in devanagari. So basically, it could boil down to which one has a more aesthetic appeal (hindi, sanskrit, bengali, tamil(tamil is a different script)) to the individual wanting to use it as a tattoo. Especially since all they seem to want it for is the exotic art appeal.
Basically, the people asking probably do not know the difference between sanskrit, hindi, bengali, tamil or any of the other numerous Indian languages - they saw it on a famous person and it becomes a fad. They think it looks "cool" and that is all they want.
It is like when Madonna slapped a bindi on and my sales for bindis hit the roof - now nobody is buying them anymore. Problem is the tattoos are permanent.
You would be better off finding the script you like best and having a stencil made. Then when you go to the clubs, parties etc you stencil the design on and wash it off later. That way when you are 80 years old you are not smoothing out the wrinkles so people can see what that smudge is on your body! /images/graemlins/grin.gif
By the way, the script used in Tamil is really cool! Smooth curvy and flows nicely from letter to letter.
Here is an example of Tamil script:
Says "Curry"