The correct spelling of the surname "Guitterez" is typically spelled with two "t's" and one "r" between the "t's." This can be represented phonetically as /ɡiˈtɛrɛz/. The "g" is pronounced like a "j" sound, and the stress is on the second syllable. The "u" is pronounced as a short "i," and the "er" sound is represented by the combination of the letter "e" and the letter "r." Overall, the spelling of "Guitterez" follows common English phonetic rules.