The word "santoyo" is commonly misspelled due to its unique phonetic structure. It is pronounced as [sän-toi-ō] with stress on the second syllable. The trick to spelling this word correctly is to remember that it starts with an "s" and has a "y" in the middle. The "a" in the first syllable is pronounced like the "a" in "father," whereas the "o" in the last syllable is pronounced like the "o" in "go." By remembering these phonetic details, the spelling of "santoyo" becomes much easier to grasp.