The spelling of the word "schoemaker" may seem a bit odd, but it actually follows the rules of English phonetics. In IPA (International Phonetic Alphabet), it is spelled /ˈʃuːməkər/. This means that the first syllable is pronounced like "shoe," the "a" in the second syllable is pronounced like the "a" in "about," and the final "er" is pronounced like "er" in "mother." So, even though the spelling may not be intuitive, the pronunciation follows the usual English patterns.
The word schoemaker has its origins in the Middle Dutch language. It is derived from the combination of the words schoe meaning shoe and maker meaning one who makes.