Future
late Middle English: via Old French from Latin futurus, future participle of esse ‘be’ (from the stem fu-, ultimately from a base meaning ‘grow, become’).
wiktionary
From Middle English future, futur, from Old French futur, from Latin futūrus, irregular future active participle of sum(“I am”), from Proto-Indo-European *bʰuH-(“to become, be”). Cognate with Old English bēo(“I become, I will be, I am”). More at be. Displaced native Old English tōweard and Middle English afterhede(“future”, literally “afterhood”) in the given sense.
etymonline
future (adj.)
late 14c., "that is yet to be; pertaining to a time after the present," from Old French futur "future, to come" (13c.), from Latin futurus "going to be, yet to be," as a noun, "the future," irregular suppletive future participle of esse "to be," from PIE root *bheue- "to be, exist, grow." In grammar, of tense, from 1520s.
future (n.)
"future events; time to come," late 14c., modeled on Latin futura, neuter plural of futurus (see future (adj.)).
