ray (n.1) Look up ray at Dictionary.com
"beam of light," c. 1300, from Old French rai (nominative rais) "ray (of the sun), spoke (of a wheel); gush, spurt," from Latin radius "ray, spoke, staff, rod" (see radius). Not common before 17c. [OED]; of the sun, usually in reference to heat (beam being preferred for light). Science fiction ray-gun is first recorded 1931 (but the Martians had a Heat ray weapon in H.G. Wells' "War of the Worlds," 1898).
ray (n.2) Look up ray at Dictionary.com
type of fish related to sharks, early 14c., from French raie (13c.), from Latin raia, a word of unknown origin, but with apparent cognates in Germanic (Middle Dutch rogghe, Old English reohhe); perhaps a loan-word from a substrate language.