noun
second son; Jirō (male given name)
Primarily used as a male given name or part of a name, often for a second-born son. The literal meaning 'second son' is understood but the word is not used as a common noun in modern Japanese.
彼の名前は次郎です。
His name is Jirō.
次郎は私の弟です。
Jirō is my younger brother.
From 次 (ji, 'next') + 郎 (rō, 'son'), a traditional naming pattern for sons in order of birth.