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In Polynesian mythology, Hawaiki (also rendered as "Avaiki" (Society Islands), "Savai'i", (Samoa), "Havaiki" (Reo Tahiti)) is the original home of the Polynesian peoples, before dispersal across Polynesia. It also features as the underworld in many Māori stories.
Linguists have reconstructed the term to Proto-Nuclear Polynesian *sawaiki.
The Māori word Hawaiki figures in legends about the arrival of the Māori in Aotearoa (New Zealand). The same concept appears in other Polynesian cultures, the name appearing variously as Havaiki, Havai'i, or 'Avaiki in other Polynesian languages, though Hawaiki or the misspelling "Hawaiiki" appear to have become the most common variants used in English. Even though the Sāmoans have preserved no traditions of having originated elsewhere, the name of the largest Sāmoan island Savaiʻi preserves a cognate with the word Hawaiki, as does the name of the Polynesian islands of Hawaiʻi (the ʻokina denoting a glottal stop that replaces the "k" in some Polynesian languages).
On several island groups including New Zealand and the Marquesas the term has been recorded as associated with the underworld and death. William Wyatt Gill discusses at length the legends about 'Avaiki as the underworld or Hades of Mangaia in the Cook Islands. Gill (1876:155) records a proverb: Ua po Avaiki, ua ao nunga nei – 'Tis night now in spirit-land, for 'tis light in this upper world." Tregear (1891:392) also records the term Avaiki as meaning "underworld" at Mangaia, probably sourced from Gill. There is of course no real contradiction in Hawaiki being the ancestral homeland (that is, the dwelling place of the ancestors) and the underworld, which is also the dwelling place of the ancestors and the spirits.
Other possible cognates of the word Hawaiki include sauali'i ("spirits" in Sāmoan) and hou'eiki ("chiefs" in Tongan). This has led some scholars to hypothesize that the word Hawaiki, and, by extension, Savai'i and Hawaiʻi, may not, in fact, have originally referred to a geographical place, but rather to chiefly ancestors and the chief-based social structure that pre-colonial Polynesia typically exhibited (Taumoefolau 1996).
He-kî Hau Maka: "He kaiga iroto i te raá, iruga! Ka-oho korua, ka-û'i i te kaiga mo noho o te Ariki O'Hotu Matu'a! [Translation:] "The island towards the sun, above! Go, see the island where King Hotu Matu'a will go and live!"
Englert puts forward the claim that Hiva lies to the West of the island. The name "Hiva" is found in the Marquesas Islands, in the names of several islands: Nuku Hiva, Hiva Oa and Fatu Hiva (although in Fatu Hiva the "hiva" element may be a different word, ʻiva). It is also notable that in the Hawaiian Islands, the ancestral homeland is called Kahiki (a cognate of Tahiti, where at least part of the Hawaiian population came from).
According to various oral traditions, the Polynesians migrated from Hawaiki to the islands of the Pacific Ocean in open canoes, little different from the traditional craft found in Polynesia today. The Māori people of New Zealand trace their ancestry to groups of people who reportedly travelled from Hawaiki in about 40 named canoes (waka) (compare the discredited Great Fleet theory of the Polynesian settlement of New Zealand).
Polynesian oral traditions say that the spirits of Polynesian people return to Hawaiki after death. In the New Zealand context, such return-journeys take place via Spirits Bay, Cape Reinga and the Three Kings Islands at the extreme north of the North Island of New Zealand — giving a possible pointer as to the direction in which Hawaiki may lie.
Until recently[update], many anthropologists had doubts that the canoe-legends described a deliberate migration, tending to believe that the migration occurred accidentally when seafarers became lost and drifted to uninhabited shores. In 1947 Thor Heyerdahl sailed the Kon-Tiki, a balsa-wood raft, from South America into the Pacific in an attempt to show that humans could have settled Polynesia from the eastern shores of the Pacific Ocean, with sailors using the prevailing winds and simple construction techniques.
However, DNA, linguistic, botanical, and archaeological evidence indicates that the Austronesian-speaking peoples (including the Polynesians) probably originated from islands in eastern Asia, possibly from Taiwan, and moved southwards and eastwards through the South Pacific Ocean. The common ancestry of all the Austronesian languages, of which the Polynesian languages form a major subgroup, as well as all Austronesian language families but Malayo-Polynesian existing only in Taiwan, support this theory. The sweet potato, which is of South American origin, is widely cultivated in Polynesia, indicating that some interaction between the Polynesians and the Amerindians of South America must have taken place. However, no Polynesian crops were introduced into the Americas, and there is no evidence of Polynesian settlement. This evidence indicates that at least some of the migration occurred using the prevailing winds. Austronesian and Polynesian navigators may have deduced the existence of uninhabited islands by observing migratory patterns of birds.
In recent decades, boatbuilders (see Polynesian Voyaging Society) have constructed ocean-going craft using traditional materials and techniques, and have sailed them over presumed traditional routes using ancient navigation methods, showing the feasibility of such deliberate migration.