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Name is of south sami origin reference Professor FInnic-Ugric Bergsland, Knut (1994). Fragment av samisk historie. Røros: Foredrag Saemien Våhkoe. The name is derived from loussa meaning salmon or salmon family fish. The name was noted in Hædrums maps of 1673. —Preceding unsigned comment added by XiXaXo (talk • contribs) 20:10, 29 July 2008 (UTC)[reply]
The name is of Old Norse origin and means "light", hence it is named Ljusnan today (ljus is Swedish for light). The name is related to the town Ljusdal ("Ljusnan dale", more fully "the light river dale") in Hälsingland, which was spelled Lyusdal in 1314. //Heimvennar - divider21:26, 29 July 2008 (UTC)[reply]