zu - Wiktionary
https://en.wiktionary.org/wiki/zu
Jun 23, 2022 · From Proto-Basque *zu, originally a second-person plural pronoun. Over time, it came to be used as a polite second-person singular pronoun; while hi went from being a general second-person singular pronoun to a strictly informal one. In all the written record it appears as a singular pronoun, but it might have survived as a plural pronoun up to ...
DA: 70 PA: 79 MOZ Rank: 15