The Anglo-Saxon kingdom of Mercia took its name from West Saxon mearc "marches", which in this instance referred explicitly to the territory's position on the Anglo-Saxon frontier with the Romano-British to the west.
Anglosakside kuningriik Mercia sai oma nime läänesaksi sõnast mearc "margid", mis antud juhul viitas selgelt territooriumi asukohale anglosakside piirimaal romanobrittidega läänes.