Incidentally, the author of Kiki's Delivery Service mixed the two up and used the trademarked version instead of the generic one. When the anime was being made several years later, someone decided to look into it, and found that they did not actually have permission to use the trademark. But, the owner of the trademark agreed to let them use it, so they didn't have to change the name of the anime adaptation.

Meanwhile, I'm off to write a book about people who google xeroxing kleenex.