There isn't one.
Though, I suppose that you could use Vanna, or such related.
Alyx Vance, daughter of Eli Vance who is from the first game :)
Vance DeGeneres's birth name is Vance Elliott DeGeneres.
Vance Bourjaily's birth name is Vance Nye Bourjaily.
Vance Brand's birth name is Vance DeVoe Brand.
Vance McLean's birth name is Vance McLean Ball.
Vance Meadows's birth name is Vance Thompson Meadows.
Vance Gerry's birth name is Vance Bryden Gerry.
Cyrus Vance's birth name is Vance, Cyrus Roberts.
Dazzy Vance's birth name is Charles Arthur Vance.
Jordan Vance's birth name is Vance, Jordan Michael.
Vance Trussell's birth name is Phillip Vance Trussell.
Schuster Vance's birth name is Henry Schuster Vance III.