The spelling of the surname "Petterson" can be confusing, as there are several ways to spell it phonetically. In IPA symbols, it can be spelled /pɛtərsən/, with the first syllable pronounced "pet" as in "house pet", the second syllable pronounced "er" as in "jumper", and the final syllable pronounced "son" as in "Jason". Variations can include an "o" sound for the second syllable, and an "en" sound for the final syllable. It is important to verify the correct spelling with the individual in question.