“writing brush” in Japanese is 筆, read hitsu, fude (ひつ, ふで). It is a Grade 3 Kyōiku kanji, taught in year 3 of Japanese elementary school, and appears in words such as 鉛筆 (pencil).
What does 筆 mean?
筆で名前を書く。
Same sound, different character — the classic trap. Compare them side by side: