Valiant

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Middle English (also in the sense ‘robust, well-built’): from Old French vailant, based on Latin valere ‘be strong’.

wiktionary

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From Middle English vailaunt(“having or showing courage or valour, valiant; characterized by valour; powerful, strong; person of valour or strength; excellent, worthy; beneficial, useful; valuable; legally valid, binding”)[and other forms], [1] from Anglo-Norman vaillaunt, vaylant[and other forms], and Old French vailant, vaillant(“brave, valiant; having value, valuable”)[and other forms], from the present participle of valoir(“to have value; to be worth”), from Latin valēre, [2] the present active infinitive of valeō(“to have value; to be worth; to be strong; to have influence or power”), ultimately from Proto-Indo-European *h₂welh₁-(“powerful, strong; to rule”).

etymonline

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valiant (adj.)

early 14c. (late 12c. in surnames), "brave, courageous, intrepid in danger," from Anglo-French vaylant, and Old French vaillant "stalwart, brave," present-participle adjective from valoir "be worthy," originally "be strong," from Latin valere "be strong, be well, be worth, have power, be able, be in health," from PIE root *wal- "to be strong." As a noun, "valiant person," from c. 1600. Related: Valiantly.