Yahoo recently published the twenty most commonly misspelled words on their search engine. They are:
Wallmart (Wal-Mart)
Rachel Ray (Rachael Ray)
Amtrack (Amtrak)
Hillary Duff (Hilary Duff)
Katherine McPhee (Katharine McPhee)
SEO for Misspelled Words
Optimizing a website for misspelled words is often recommended by many people within the search engine optimization SEO community.