The spelling of the word "heem" may appear unusual to some, but it follows the rules of English phonetics. The pronunciation of "heem" is /him/ with a short vowel sound followed by the consonant sound /m/. The double "e" in the spelling indicates a long vowel sound, but in this case, it is unnecessary as the short vowel sound is already present. The spelling may have originated from a regional dialect or simply as a creative spelling variation.