Mercia

Latinate form of MERCY. This was also the name of an old Anglo-Saxon kingdom, though it has a different origin.

MERCY   female   English
From the English word mercy, ultimately from Latin merces "wages, reward", a derivative of merx "goods, wares". This was one of the virtue names adopted by the Puritans in the 17th century.
EQUIVALENTS
ENGLISH: Mercy
DIMINUTIVES AND SHORT FORMS
ENGLISH: Merry