Best storm name ever. (I’ll ignore the misspell.)
According to weather.com
Gandolf is named for a character in the William Morris fantasy novel The Well at The World’s End(1896). Similar names such as Gandalf and Gandalfr can be traced to Norse sagas of the 12th century; the name is derived from the Norse words for “wand” or “staff” (also interpreted as “magic”) and “elf.”
As an aside, if you rearrange the letters in “Gandolf” you get “fog land,” and indeed areas well south and east of Gandolf’s track may be a “fog land” with unusually warm, moist air streaming north into the eastern U.S. over relatively cold ground, leading to widespread fog and low cloud cover.