The word "Hellenic" is an effort to write a Greek word using English characters. So "Hellas" is an effort to write "Ελλάς" (en.wiktionary.org), where there is no "H" and the last vowel is accented instead of the first one.
https://en.wiktionary.org/wiki/hell also has some interesting notes.
The word "Hellenic" is an effort to write a Greek word using English characters. So "Hellas" is an effort to write ["Ελλάς"](https://en.wiktionary.org/wiki/%CE%95%CE%BB%CE%BB%CE%AC%CF%82), where there is no "H" and the last vowel is accented instead of the first one.
https://en.wiktionary.org/wiki/hell also has some interesting notes.
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