late 14c., indowen "provide an income for," from Anglo-French endover, from en- "in" (see en- (1)) + Old French douer "endow," from Latin dotare "to endow, bestow, portion," from dos (genitive dotis) "marriage portion," from PIE *do-ti, from root *do- "to give." Related: Endowed; endowing.
<a href="https://www.etymonline.com/word/Endowed">Etymology of Endowed by etymonline</a>
Harper, D. (n.d.). Etymology of Endowed. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/Endowed