Nadra
Yes. Nadra comes from the Arabic adjective نادرة (nādira), the feminine form of نادر (nādir), meaning 'rare' or 'precious.'
No. The word نادرة as a feminine adjective is Arabic but the personal name Nadra does not occur as a given name in Qur'anic text; quranic_reference is therefore empty.
Yes. Nadra has been adopted into Urdu- and Sindhi-speaking Muslim communities and appears in literature and family naming registers there.
It connotes rarity and value—someone unique or precious—making it a poetic choice rather than an ordinary descriptive name.
Yes. The masculine counterpart is نادر (Nadir), meaning 'rare, uncommon, precious.'