Garner

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Middle English (originally as a noun): from Old French gernier, from Latin granarium ‘granary’, from granum ‘grain’.

wiktionary

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From Middle English gerner, from Old French gernier, guernier, variant of grenier, from Latin grānārium(“granary”). Doublet of granary.

etymonline

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garner (n.)

"a granary," late 12c., gerner, from Old French gernier, metathesized variant of grenier "storehouse, loft for grain," from Latin granarium (usually plural, granaria) "store-house for grain," from granum "grain," from PIE root *gre-no- "grain."

garner (v.)

late 15c., "to store grain," from garner (n.). Related: Garnered; garnering.