Spelled Fuse in maps of the 19th century and earlier, the name is thought to derive from the ancient Fosa flumen, after which the Germanic tribe of the Fosi took their name (or vice versa).
Kirjapildi Fuse järgi 19. sajandi kaartidel ja varem arvatakse, et see tulenes iidsest Fosa flumenist, mille järgi germaani hõim fosid sai oma nime (või vastupidi).