'Crown' comes from Latin 'corona' (wreath) — royalty borrowed its headpiece from the victor's garland.
A circular ornamental headdress worn by a monarch as a symbol of authority; also, the top or highest part of something.
From Old French 'corone' (crown), from Latin 'corona' (garland, wreath, crown), from Greek 'korōnē' (anything curved, a crow, a garland), from PIE *sker- (to turn, to bend) or *ker- (horn, head), the same root underlying Latin 'curvus' (curved) and 'cornu' (horn). The Greek 'korōnē' covered several curved objects — a crow (curved beak), a wreath, the tip of a bow. Latin 'corona' specialised into the ceremonial headdress. The word entered Old English
A 'coroner' was originally the 'crowner' — an officer of the crown responsible for investigating deaths that might affect royal revenue (such as treasure trove or the estates of felons). The word comes from Anglo-Norman 'corouner,' from 'coroune' (crown). The medical 'coronary' (as in coronary artery) comes from the same root — the arteries 'crown' the heart