Rarahu is a genus of jumping spiders endemic to Samoa. As of 2017, it contains only one species, Rarahu nitida. Berland probably adapted the genus name Rarahu from Pierre Lotis book of the same name, which was published in 1880. Loti himself either used the rare Tahitian word "rarahu", meaning "to eat tapu things", or changed the name of the volcano "Raraku". The species name is from Latin nitida "shining", "handsome", or "neat".