Kiwi entered English in the 19th century, first attested in 1835, borrowed from Maori, the Polynesian language of New Zealand. The word originally referred exclusively to the flightless, nocturnal birds of the genus Apteryx, endemic to New Zealand. The Maori word kiwi is believed to be onomatopoeic, imitating the shrill, repeated call of the male bird, which sounds roughly like kee-wee in the darkness of the New Zealand bush.
The Maori language belongs to the Eastern Polynesian branch of the Austronesian language family, a vast language family stretching from Madagascar in the west to Easter Island in the east. A tentative Proto-Polynesian reconstruction *kiwi, meaning plover, has been proposed, suggesting that the word may have referred to a different bird in the ancestral Polynesian homeland before being transferred to the distinctive New Zealand species after Polynesian settlers arrived in New Zealand around 1250 to 1300 CE. However, this reconstruction lacks the comparative depth needed for certainty, and the onomatopoeic nature of the word means it could have been independently coined in New Zealand.
The kiwi bird itself is one of the most unusual creatures in ornithology. It is the only bird with nostrils at the tip of its bill rather than at the base, has hair-like feathers unique among birds, lays eggs that are proportionally the largest of any bird relative to body size, and is functionally more similar to a mammal than to most other birds in its ecological niche. These peculiarities made the kiwi an object of scientific curiosity from the earliest European descriptions, and the Maori name was adopted without alteration into English naturalist writing.
The word kiwi developed a second major meaning in the 1960s through a deliberate marketing decision. The fruit now known as kiwifruit is native to China, where it was called yang tao (literally sun peach) or mi hou tao (macaque peach). It was introduced to New Zealand in 1904 and commercially cultivated from the 1940s onward under the name Chinese gooseberry. In 1959, New Zealand exporters, concerned that the association with China might attract tariffs and that gooseberry sounded unappealing, rebranded the fruit as kiwifruit, drawing on the visual resemblance between the brown, fuzzy fruit and the brown, fuzzy bird. The marketing rebrand was extraordinarily successful, and kiwi or kiwifruit is now the standard
A third sense of kiwi emerged as an informal demonym for New Zealanders themselves. This usage developed in the early 20th century, particularly during World War I, when New Zealand soldiers were called Kiwis. The connection between the bird and national identity had already been established through the kiwi's appearance on military badges and insignia. Today, Kiwi as a demonym is standard informal usage, embraced by New Zealanders themselves.
The word has no established cognates in other Polynesian languages with the specific meaning of the Apteryx bird, consistent with the species being endemic to New Zealand and unknown to Polynesian speakers elsewhere. In modern English, kiwi circulates freely across its three meanings, with context typically making clear whether the bird, the fruit, or a New Zealander is intended.