This is a very funny question which has many answers.. from person to person... from country to country.. from region to region... from mood to mood....
Gentle people answers to the question with their identity...
but the short tempered people answer this question with another question Who are you to ask this?..
If you stand in the middle of a battlefield or Army then your answer will be your Nationality.... ( by the way I am an INDIAN)
etc.
:) Such kind of questions with lot of answers lead you to a state of mind that you are no one when you compare with the whole world/ nature.
Thats why the monks says I AM NO ONE when we ask this question to them.
understand that you are nothing when you compare to the nature.