WordNet (r) 3.0 (2006):

Niger
    n 1: an African river; flows into the South Atlantic [syn:
         Niger, Niger River]
    2: a landlocked republic in West Africa; gained independence
       from France in 1960; most of the country is dominated by the
       Sahara Desert [syn: Niger, Republic of Niger]

Easton's 1897 Bible Dictionary:

Niger
   black, a surname of Simeon (Acts 13:1). He was probably so
   called from his dark complexion.


Hitchcock's Bible Names Dictionary (late 1800's):

Niger, black