Valborg is probably a Norse/Scandinavian variation of
Walburga.
St
Walburga (after whom Walpurgis Night is named) was a 6th-century English missionary in Germany. Walpurgis Night is the evening/night before St
Walburga's feast day, the 1st of
May.
Walburga and its variations have completely dropped out of use in England.
♦ Chrisell ♦
All we have to decide is what to do with the time that is given us. - J.R.R. Tolkien.