Ni-Vanuatu is a demonym used to refer to all Melanesian ethnicities originating in Vanuatu. It also refers, more generally, to nationals and citizens of Vanuatu, whatever their ethnicity. It is more frequently used than the demonym Vanuatuan, which is regarded as incorrect by some authors and style guides.
This recent coinage builds on the particle ni, which in some indigenous languages encodes the genitive, similar to the English 'of'. Thus Ni-Vanuatu literally means 'of Vanuatu'.
Ni-Van is sometimes used as an abbreviation of Ni-Vanuatu. This term was pejorative in its original usage in the 1980s by Anglophone European expatriates, similar to its French equivalent les nis, but according to New Zealand linguist Terry Crowley by the 2000s the term Ni-Van saw increasing usage among Ni-Vanuatu.