Enrich

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late Middle English (in the sense ‘make wealthy’): from Old French enrichir, from en- ‘in’ + riche ‘rich’.

wiktionary

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From Middle English enrichen, from Anglo-Norman enrichir and Old French enrichier.

etymonline

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enrich (v.)

late 14c., "to make wealthy," from Old French enrichir "enrich, enlarge," from en- "make, put in" (see en- (1)) + riche "rich" (see rich). Figurative sense "supply with abundance of something desirable" is from 1590s. Meaning "to fertilize" is from c. 1600. Scientific sense of "to increase the abundance of a particular isotope in some material" is first attested 1945. Related: Enriched; enriching.