late 13c., "cook (something) in a shallow pan over a fire," from Old French frire "to fry" (13c.), from Latin frigere "to roast or fry," from PIE *bher- "to cook, bake" (source also of Sanskrit bhrjjati "roasts," bharjanah "roasting;" Persian birishtan "to roast;" perhaps also Greek phrygein "to roast, bake"). Intransitive sense is from late 14c. U.S. slang meaning "execute in the electric chair" is U.S. slang from 1929. As a noun, "fried meat," from 1630s. Related: Fried; frying. Frying pan recorded from mid-14c.
early 14c. (late 13c. in Anglo-Latin), "young fish," probably from an Anglo-French noun from Old French frier, froier "to rub, spawn (by rubbing abdomen on sand)," from Vulgar Latin *frictiare. First applied to human offspring c. 1400, in Scottish. Some sources trace this usage, or the whole of the word, to Old Norse frjo, fræ "seed, offspring."