Properly, the father of the Sun and Moon, but by poets made a surname of the Sun. Shakespeare makes it a synonym of Apollo. The proper pronunciation is Hyperion. Thus Ovid—
“Placat equo Persis radiis Hyperione cinctum.”
Fasti, i. 385.
So excellent a king, that was to this Hyperion to a satyr.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894