Pyjamas and bungalow are examples of borrow words from India. India has rather a lot of languages and I don't think you can lump them all into "Indian".
"Char" as in "cuppa char?" is the usual spelling (would you like a cup of tea?)
According to this: http://www.rmg.co.uk/discover/explore/cup-char it is likely that "char" is derived from Chinese (another country with rather a lot of languages - would the real Chinese please stand up!)