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English word glad comes from Proto-Indo-European *g̑ʰel-
*g̑ʰel- (Proto-Indo-European)
to shine
*ǵh₂r- (Proto-Indo-European)
*gladaz (Proto-Germanic)
(of a countenance) bright; cheery; cheerful. (of a surface) glossy; sleek; slick; smooth; flat. Shining; shiny; radiant.
glædra (Old English)
gled (Middle English)
glad (English)
(obsolete) Having a bright or cheerful appearance; expressing or exciting joy; producing gladness.. Pleased, happy, gratified. (archaic, transitive) To make glad.