Hän is a Na-Déné language of the Northern Athabaskan sub-group. It is spoken in Dawson City, Yukon, Eagle and Fairbanks, Alaska by about 15 people, who call themselves Hän Hwëch'in or "people who live along the (Yukon) River". Hän is closely related to Gwich’in and Upper Tanana.
A writing system was established for Hän in the 1970s.
http://www.schoolnet.ca/aboriginal/tribute/han-e.html
Information about the Hän language
http://www.languagegeek.com/dene/yukon/han.html
Community Profile of the Hän Hwëch'in people
http://www.yfnta.org/community/Profile.asp?First_Nation=18
Apache, Chipewyan, Eyak, Gwich'in, Hän, Navajo