Rarotongan (MÄori KÅ«ki 'Äirani) Rarotongan or Cook Islands Maori is an Polynesian language spoken on the island of Rarotonga in the Cook Islands. It's closely related to Taihitian and Maori. Some sources classify Rarotongan as a dialect of Cook Islands Maori (MÄori KÅ«ki 'Äirani). Other Cook Islands Maori dialects are Rakahanga-Manihiki; Tongareva dialect (Penrhyn); Ngaputoru dialects of Atiu, Mitiaro and Mauke; Aitutaki; and Mangaia.