Nope, actually started using Zanzibar when the old Zima commercials were on...just the way the lead guy said the name struck me as funny. Soon after, I needed a handle for PlayerVPlayer Warcraft, so I used it. Go figure.
Also, waaaaay back when I was in High School, there was a local bunch of guys that made up a semi-gag punk band called Vomitorium. They all took random made-up names, and one of them was named Zanzibar Buck-Buck Detestibilis McFate. All of the guys took really wacky names like that...it was funny. I guess you had to be there.
Here's a sampling from their last album, "Ad Nauseum" :
(From the song "Who Died At My Party?")
Who died at my party?
Who was the louse?
Who died at my party
and stunk up my house???
As you can see, these guys are NOT to be taken seriously