Named after the Tahltan Indians, whose name can be translated as 'something heavy in the water.' The Indian story behind this naming is a follows: during a salmon run, two women stood on opposite banks of the Tahltan River. One asked the other what she saw on the surface of the water. The other replied. 'something heavy is going up the little water,' referring to the ascending salmon working their way up through the rapids of a smaller stream.
Source: Akrigg, Helen B. and Akrigg, G.P.V; British Columbia Place Names; Sono Nis Press, Victoria 1986 /or University of British Columbia Press 1997