Citizen of new zealand is called

A Kiwi!

A citizen of New Zealand is commonly referred to as a "New Zealander" or a "Kiwi". The term "Kiwi" is also used to refer to the national symbol of New Zealand, the kiwi bird, which is a small, flightless bird native to the country.

In informal contexts, New Zealanders often refer to themselves as "Kiwis", and the term has become a source of national pride and identity.