1. Hupa - Noun
2. Hupa - Proper noun
the Athapaskan language spoken by the Hupa
a member of the Athapaskan people of the Trinity River valley in California
Source: WordNetThus, the Proto-Athabascan word *tuː ('water') is toneless toː in Hupa, high-tone tó in Navajo, and low-tone tù in Slavey; while Proto-Athabascan *-ɢʊtʼ ('knee') is toneless -ɢotʼ in Hupa, low-tone -ɡòd in Navajo, and high-tone -ɡóʔ in Slavey. Source: Internet
Other Athabascan languages, namely those in western Alaska (such as Koyukon ) and the Pacific coast (such as Hupa ), did not develop tone. Source: Internet