Majd al-Din
No single phrase 'Majd al-Din' appears as a proper name in the Quran; it is a compound using Arabic words found in Islamic sources and used historically as an honorific.
Yes — the structure 'X al-Din' (e.g., Majd al-Din) has been widely used as an honorific laqab in medieval Islamic scholarly and clerical contexts and later in Persian/Urdu naming.
Yes; it is respectful and formal. Families often choose it to convey religious dignity, though it is rarer as a simple given name today.
The name is Arabic in origin and became established within Persianate and Urdu-speaking Islamic cultures as an honorific compound.
Common transliterations include 'Majd al-Din', 'Majduddin', or 'Majd ad-Din'.