Elfreda

Middle English form of the Old English name Ælfþryð meaning "elf strength", derived from the element ælf "elf" combined with þryþ "strength". Ælfþryð was common amongst Anglo-Saxon nobility, being borne for example by the mother of King Æðelræd the Unready. This name was rare after the Norman Conquest, but it was revived in the 19th century.