The spelling of the word "Heyen" is a bit tricky to decipher without proper knowledge of the International Phonetic Alphabet (IPA). The correct pronunciation of the word is /ˈhaɪən/, which consists of two syllables. The first syllable is pronounced as "hahy", with the "aɪ" representing the diphthong sound of the letters "a" and "y". The second syllable is pronounced as "ən", with the "ə" representing the schwa sound, which is a neutral vowel sound. Together, the pronunciation of "Heyen" sounds like "HIGH-uhn".