ǣcern n (nominative plural ǣcernu)
From Proto-Germanic *akraną, perhaps from Proto-Indo-European *h₂ógeh₂ (“berry”). Cognate with Old Frisian akern, Old Saxon akeran, Old Norse akarn (Danish agern), Old High German ackeran (German Ecker), Gothic 𐌰𐌺𐍂𐌰𐌽 (akran).
Folk-etymologized as āc + corn.