The Collaborative International Dictionary of English v.0.48:

Sindi \Sind"i\, n. [Ar. Sind[imac], fr. Sind Indian, Skr. sindhu
   river, sea, the river Indus, the country along the Indus. Cf.
   Indian, Hindoo.] (Ethnol.)
   A native of Sind, India, esp. one of the native Hindoo stock.
   [Webster 1913 Suppl.]