What is "ecgwynn"

Ecgwynn or Ecgwynna (fl. 890s), was the first consort of Edward the Elder, later King of the English (r. 899–924), by whom she bore the future King Æthelstan (r. 924–939), and a daughter who married Sihtric Cáech, Norse king of Dublin, Ireland and Northumbria. Extremely little is known about her background and life. Not even her name is given in any sources until after the Norman Conquest. The first to record it is William of Malmesbury, who presents it in Latinised guise as ''Egwinna ''and who is in fact the principal source for her existence.