Either with a helper column and the PROPER function or VBA event code to
change in-cell when entered.
Private Sub Worksheet_Change(ByVal Target As Excel.Range)
If Target.Column <> 1 Then Exit Sub 'adjust to suit
On Error GoTo ErrHandler
Application.EnableEvents = False
Target.Formula = Application.Proper(Target.Formula)
ErrHandler:
Application.EnableEvents = True
End Sub
Gord Dibben MS Excel MVP