IF statement...If InputBox value equals any value within a certain named range...

Hey I am trying to make an IF statement as part of a lookup and filter macro for a guest list, and I am trying to get any value within a Named range (Its called ActualGuestSurname)

How do I make the IF statment compare the input to any value in this named range?

Thanks
Here is the macro so far (Line I can't figure out in red, in my own words)

Sub Macro1()

Dim intGuestSurname As String
strGuestSurname = InputBox("Enter Guest Surname")

If strGuestSurname = NamedRange("ActualGuestSurname") Then

Application.Goto Reference:="GuestSurname"
ActiveCell.FormulaR1C1 = strGuestSurname
Range("GuestDatabase").AdvancedFilter Action:=xlFilterInPlace, CriteriaRange:= _
Range("Criteria"), Unique:=False

Else
MsgBox "That Guest is not on record", vbCritical

End If


End Sub