Old English wyn or wynn means 'delight, joy'.
"Gandalf is a substitution in the English narrative on the same lines as the treatment of Hobbit and Dwarf names. It is an actual Norse name (found applied to a Dwarf in Völuspá) used by me since it appears to contain gandr, a staff, especially one used in "magic," and might be supposed to mean "Elvish wight with a (magic) staff." (UT 4,II)
Everything else is stated in the books as well as long as it is significant.
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