Zulqarnayn
The epithet appears in the Qur'an, Surah al-Kahf (18:83–98), describing a powerful and righteous figure commissioned to travel to the ends of the earth.
Classical and modern scholars have proposed several identifications (e.g., a Hellenistic king, a local ruler), but there is no single consensus; in Islamic tradition the Qur'anic narrative is read primarily for its moral and theological lessons.
Zulqarnayn is used but relatively rare as a personal name; it is more commonly encountered as a historical or literary epithet in tafsir and classical literature.
The phrase 'Two Horns' (al-qarnayn) is an epithet; exegetes interpret it variously (symbolic authority, geographical reach, or iconography) rather than as a literal description, and interpretations differ across sources.
Yes, it can be used, typically in cultures that favor Quranic or classical Arabic epithets; families often choose variants (e.g., Dhul-Qarnayn) depending on local pronunciation and orthography.