I helped co-found a guild back when WOW was new - I was the guild webmaster. The guild never really got that big or active, but here it is 20 years later and I still occasionally get credit card offers in the mail for “The Blackrazor Brotherhood.”
Some of my favorite gaming memories are from my time in a guild called The Sylvan Guard on an EverQuest server around 1998 or so. It was a small guild but the last time I saw a question similar to this posted, on Reddit a few years ago, I checked in and so did a former guild-mate I hadn’t spoken with in decades.