 Prior to 1891, the name "Tatshenshini" did not refer to the present-day Tatshenshini River.Instead, the name referred to the present-day Blanchard River, which is a tributary of the present-day Tatshenshini River, located about upstream from Dalton's trading post.In 1891, or shortly thereafter, the Canadian government reassigned the name "Tatshenshini" from the present-day Blanchard River to the present-day Tatshenshini River.