Using Autofilter With Named Range - What To Put In Field

I am writing a code that will filter based on a named range. My named range is "Region," and it is currently in column B, but may be in Column C, D, E, etc., based on additional columns that the user of this sheet may add in the future.

I first had code like this (before using a named range):

HTML Code:
Sub CopyRegions()
Dim LastRow As Long

With ActiveSheet
LastRow = ActiveSheet.Cells(.Rows.Count, "A").End(xlUp).Row
End With
Application.ScreenUpdating = False
Range("B8").Select
ActiveSheet.Range("$8:$" & LastRow).AutoFilter Field:=2, Criteria1:="Europe"

But then I named column B to "Region," and so I want to do the same thing as above, but I don't know what to put where it has the number "2" - "AutoFilter Field:=2" because it may or may not be the second column in the future.