Walburga combines the Old English weald (rule) and burh (fortress). **Saint Walburga (c. 710-779)** was the English Benedictine missionary, sister of Saint Willibald, **who traveled to Germany with Saint Boniface and Saint Lioba**. **Her feast day on May 1 became Walpurgis Night** — the eve famously associated with witches' Sabbaths in German tradition (featured in Goethe's Faust).
Featured in Hugo Wolf's lieder and many German operas.
Walburga reduces to seven — the number of Anglo-Saxon missionary.