“husband / man” in Japanese is 夫, read fu, fuu, otto (ふ, ふう, おっと). It is a Grade 4 Kyōiku kanji, taught in year 4 of Japanese elementary school, and appears in words such as 夫婦 (married couple).
What does 夫 mean?
あの人は姉の夫だ。
Same sound, different character — the classic trap. Compare them side by side: