'Helios' originates from Ancient Greek, specifically the word 'Ἥλιος', where 'Ἥλιος' meant 'sun'.

'Ἥλιος' remained largely unchanged as it transitioned into Latin as 'Helios' and eventually became the modern English word 'Helios'.

Initially, it meant 'sun', and this meaning has largely remained the same in modern usage.