The word "Tiernie" is spelled phonetically as /ˈtɪərni/. The first syllable "tier" is pronounced with a long "e" sound, while the second syllable "nie" is pronounced with a short "i" sound. The spelling of the word may seem confusing, but it is important to note that unfamiliar spellings of words do exist. In this case, it may be helpful to familiarize oneself with the phonetic transcription of the word to ensure proper pronunciation.