"Heiar" is not a commonly used word, and it is unclear what it may represent. However, if the spelling is intended to represent a phonetic transcription of a word, it could be pronounced /ˈhiːər/. The first syllable is pronounced like "hi" and the second syllable rhymes with "near". It is possible that the word may be a variation of "hearer" or "higher", but without further context or information, it is difficult to determine its intended meaning.