Whoami

Most of the states in India speak their own language.

Tamil in Tamil Nadu, Marathi in Maharashtra, Kashmiri in Kashmir and so on ...

When we call someone a Kannadiga or a Bong (as the Bengalis are fondly called), are we refering to the state that he hails from or his mother-tongue ?

If it is the mother-tongue, then how come it is 'Andhrites' instead of 'Telugites' ?