Sexburga (Seaxburh) combines the Old English seax (knife) and burh (fortress). Saint Sexburga (c. 636-699) was the Anglo-Saxon queen of Kent (wife of King Eorcenberht) who founded the great abbey of Minster-in-Sheppey and later became abbess of Ely after her sister Etheldreda.
One of the four royal saint sisters of the East Anglian Wuffing dynasty.
Sexburga reduces to eight — the number of Anglo-Saxon queen-saint.