Another aspect which has always interested me is that certain (basic) words begin with the same sounds in Hindi/Urdu and English perhaps other languages too. For example the word for Sun is Suraj/ Surya in my language - something about the sound "S" that fits the characteristics of a sun? The word for Door is Darvaza, perhaps "D" is a nice solid door-like sound. There are other words too - but maybe this is just a coincidence.

I have not been able to find the equivilant of "tutoyer" in Hindi. I think children are told "Don't say tu say Aap!" But I will keep looking - there must be a word.