The correct spelling of the surname "Hermandez" is actually "Hernandez," with the stress on the second syllable. In IPA phonetic transcription, it is pronounced as hɛrˈnændɛz. Many people often misspell this name by adding an extra "m." However, the correct spelling is with an "n" instead of "m." It is common for people to misspell surnames or names in general, but it's always essential to double-check the spelling to avoid any confusion or errors.