1540s, "make compensation for, spend, pay for" (a sense now archaic); 1570s, "satisfy by payment," from Old French defraier,defrayer (15c.), perhaps from de- "out" (see de-) + fraier "spend," from frais "costs, damages caused by breakage," from Latin fractum, neuter past participle of frangere "to break" (from PIE root *bhreg- "to break").
Alternative etymology traces second element to Old High German fridu "peace," via Vulgar Latin *fredum "fine, cost." Compare affray. For possible sense development, compare pay from pax "peace."
suffix forming nouns of action from verbs, mostly from Latin and French, meaning "act of ______ing" (such as survival, referral), Middle English -aille, from French feminine singular -aille, from Latin -alia, neuter plural of adjective suffix -alis, also used in English as a noun suffix. Nativized in English and used with Germanic verbs (as in bestowal, betrothal).
<a href="https://www.etymonline.com/word/defrayal">Etymology of defrayal by etymonline</a>
Harper, D. (n.d.). Etymology of defrayal. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/defrayal