What does 人違い mean?
人違い is a Japanese noun meaning “mistaking one person for another; (case of) mistaken identity” in English. It is written as 人違い in kanji, ひとちがい in hiragana, and hitochigai in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
調べてみたら人違いだった。
When I inquired I found that it was the wrong person.