The Dolly Varden trout is native to which ocean?

Was wondering that myself Bijou. Found this: The name Dolly Varden actually refers to a colorful cloth of “pink pattern of good looks” that was milled for dressmaking in the late 19th century. The cloth itself was named after Dolly Varden, the character who wore brightly colored dresses in the Charles Dicken's 1841 novel, Barnaby Rudge.

But who was Dolly Varden?