"Helon" is not a commonly used word, and there is no clear indication of how it should be spelled. However, an IPA phonetic transcription of this word might help clarify its pronunciation. It could be spelled as [ˈhiːlɒn] with an elongated "ee" sound, the short "o" sound, and the ending "on" which can be pronounced as "ahn" or "awn." Without more context, it's difficult to know what the word "helon" means or how it's spelled.