جَاءَتْ هِنْدٌ — Hind came: nominative subject with ḍamma and tanwīn.
رَأَيْتُ هِنْدًا — I saw Hind: accusative object with fatḥa and tanwīn.
مَرَرْتُ بِهِنْدٍ — I passed by Hind: genitive after بِ with kasra and tanwīn.
The name remains definite even though its fully declinable reading permits tanwīn of declension.