The specific epithet comes from the Niuean words kalavi (land crab) and kai (food), alluding to speculation by the describers that land crabs constituted an important part of the species' diet.
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In the 1990s Worthy discovered several fossil bird species new to science, including the Long-billed Wren (Dendroscansor decurvirostris) in 1991, the Scarlett's Shearwater (Puffinus spelaeus) in 1991, and the Niue Night Heron (Nycticorax kalavikai) in 1995.