The name "Athenios" is spelled with a sequence of letter combinations that reflect its pronunciation. In IPA phonetic transcription, it can be spelled as /əˈθi.ni.ɒs/. The first syllable is pronounced as "uh," followed by the "th" sound (as in "thick") and the short "i" sound. The second syllable has a long "e" sound (as in "bee"), followed by the "n" sound and the short "i" sound. The last syllable has the "o" sound (as in "off") and the "s" sound. Overall, the spelling of "Athenios" corresponds well to its pronunciation in English.
The word "Athenios" does not have a well-defined etymology as it appears to be a fabricated term. It does not correspond to any known Greek word or name. In Greek, "Athenios" would be written as "Αθηναίος" (Athinaíos), which means "of Athens" or "from Athens" when translated to English. However, given the context of your question, it seems that "Athenios" may be a personal or fictional name without a specific etymology.