I’m hoping someone can help with this because it’s driving me crazy. I read several books in a fantasy series back in the early ‘90’s, and I’ve been trying to track them down. The series followed a lone adventurer named Grey Wolf (?), and I think they were tied into D&D somehow. At least I remember getting them in the D&D section at the used bookstore. I’m looking for the name of the series and the author, any help is much appreciated.
Is it possible you're thinking of the World of Greyhawk setting? Gary Gygax wrote several novels in the late 80's set in his Greyhawk campaign setting
The Lone Wolf Series by Joe Deaver, illustrated by Gary Chalk.
You can also find (nearly) the whole series online now at Project Aon. They've transferred most of the series, as well as the spin off books following the adventures of Grey Star the wizard and other series by the author such as his post-apocalyptic adventure Freeway Warrior, to HTML and made them freely available. Enjoy!
You might be thinking of The Witcher books by Andrzej Sapkowski. The first one was published in 1992 and the main character Geralt of Rivia is also called the White Wolf.
It has no tie-ins to D&D though.