29%RatingSave Gender Feminine Usage History (Ecclesiastical) Meaning & History Derived from the Old English elements milde "gentle" and burg "fortress". Saint Milburga, the sister of Saint Mildred, was a daughter of a 7th-century Mercian king. She was supposedly in possession of magical powers. Related NamesFamily Tree·Details Other Languages & CulturesMildburg(Anglo-Saxon) Categories defence, gentleness, history, saints