Conversation so far:
what are the two dominant ethnic groups on fiji
The population of Fiji consists of two principal ethnic groups: the indigenous Melanesian population or those of mixed Melanesian-Polynesian origin, and the Indo-Fijian population.
where does the name of fiji from
The name Fiji is derived from Fiji's main Island, Viti Levu, though the common English pronunciation is based on that of their island neighbours in Tonga.

Question: how long have people lived on the islands
Self-contained rewrite: how long have people lived on the islands of fiji