Where does “মুগ্ধ” come from?

মুগ্ধ (Bengali) comes from Sanskrit मुग्ध, from Proto-Indo-Iranian mugdʰás, from Proto-Indo-Iranian mawgʰ- — to err, to deviate, to be foolish.

মুগ্ধ (Bengali): fascinated; enchanted; spellbound; engrossed