noun
first son; Tarō (male given name)
Used as a common male given name, often for the eldest son. The kanji literally mean 'big' and 'son', implying the firstborn son.
彼の名前は山田太郎です。
His name is Tarō Yamada.
太郎は日本の代表的な男性名の一つだ。
Tarō is one of the typical male names in Japan.
次郎 (Jirō) is a common name for the second son, contrasting with 太郎 for the first son.
From 太 (ta, 'big') + 郎 (rō, 'son'), a traditional naming pattern for the eldest son.