Etymology: Derived from Japanese kanji combinations such as 勇吾 (courage + self) or 悠吾 (calmness + self), though most commonly associated with 優吾 or 雄吾. The first element often relates to bravery (勇), excellence (雄), or gentleness (優), while 'go' (吾) means 'I' or 'self', giving the name a personal and introspective quality.