The invasion from Taranaki had a heavy impact on Moriori population, culture and language, with only 101 Moriori remaining in 1862, and few speaking the language by the 1870s. However, Samuel Deighton, Resident Magistrate on the Chathams from 1873 to 1891, compiled a short vocabulary of Moriori words, with their equivalents in Māori and English. The vocabulary was published as an appendix of Michael King's Moriori: A People Rediscovered.
In 2001, as part of a cultural revival movement, Moriori people began attempts to revive the language, and compiled a database of Moriori words. There is a POLLEX (Polynesian Lexicon Project Online) database of Moriori words as well.
The 2006 New Zealand Census showed 945 people choosing to include "Moriori" amongst their tribal affiliations, compared to 35 people in the 1901 census.