I've never had that particular experience. I have had the very peculiar experience, several times, of having someone I am on the phone to--say, about my cell phone plan, or insurance, or something equally mundane, ask me, "Are you Mercedes Lackey the writer?" and then have them squee when I say yes.
Statistically speaking, the odds appear to be in their favor. Google apparently thinks there's only one Mercedes Lackey in the Milky Way. I went through page after page of search results: you, you, you, more you, still more you, you, you, that's oh wait still you, you, here some songs by oh wait looks like you, you, you, you, you...
Seriously, the first site that looked like it wasn't you was the Alexapure water purification company, thirteen pages deep. And that turned out to be someone hacked the site and stuck a link claiming to have some of your work downloadable. It wasn't: it was a fake leading to an ad leading to usenet.nl and that's as far as I was prepared to go without using a locked down system.
In case you care: [[EDIT: THERE USED TO BE A LINK HERE ~Agge]]
PS: I wouldn't explore hacked sites without extreme caution.
Once I went from sites about Mercedes Lackey to sites about works by Mercedes Lackey to sites about people who work with Mercedes Lackey to finally sites actually hacked to look like they contain works by Mercedes Lackey but are using Mercedes Lackey for click bait I figured that was enough google for one day. I probably would have had to scan through people who named their pets after Mercedes Lackey and pancakes with grill patterns that resemble fictional characters created by Mercedes Lackey before I eventually reached a totally different Mercedes Lackey. And then I'll discover on her facebook page she was named after you in 1993.
Maybe at this point you're so famous that no one wants to name their kids "Mercedes Lackey" anymore. Maybe there's only a bunch of "_M3rc3d3s L2ck3y!!!_"s out there.
[[EDIT: Removed link. People are dumb. Don't link things. They don't look before they click. ~Agge]]
Edit: PM me if you want to know the link to inform the website operator.