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Ich habe viel mit derartigen Algorithmen herumprobiert, bin aber nie zu einem zufriedenstellenden Resultat gelangt. Wenn man eine große Menge von Namen untersucht, erhält man zu viele false positives.
Meinen eigenen Code habe ich nicht mehr, aber hier ist etwas kopiertes
Function SOUNDEX(Surname As String) As String
' Developed by Richard J. Yanco
' This function follows the Soundex rules given at
' http://home.utah-inter.net/kinsearch/Soundex.html
Dim Result As String, c As String * 1
Dim Location As Integer
Surname = UCase(Surname)
' First character must be a letter
If Asc(Left(Surname, 1)) 90 Then
SOUNDEX = ""
Exit Function
Else
' St. is converted to Saint
If Left(Surname, 3) = "ST." Then
Surname = "SAINT" & Mid(Surname, 4)
End If
' Convert to Soundex: letters to their appropriate digit,
' A,E,I,O,U,Y ("slash letters") to slashes
' H,W, and everything else to zero-length string
Result = Left(Surname, 1)
For Location = 2 To Len(Surname)
Result = Result & Category(Mid(Surname, Location, 1))
Next Location
' Remove double letters
Location = 2
Do While Location If Mid(Result, Location, 1) = Mid(Result, Location + 1, 1) Then
Result = Left(Result, Location) & Mid(Result, Location + 2)
Else
Location = Location + 1
End If
Loop
' If category of 1st letter equals 2nd character, remove 2nd character
If Category(Left(Result, 1)) = Mid(Result, 2, 1) Then
Result = Left(Result, 1) & Mid(Result, 3)
End If
' Remove slashes
For Location = 2 To Len(Result)
If Mid(Result, Location, 1) = "/" Then
Result = Left(Result, Location - 1) & Mid(Result, Location + 1)
End If
Next
' Trim or pad with zeroes as necessary
Select Case Len(Result)
Case 4
SOUNDEX = Result
Case Is SOUNDEX = Result & String(4 - Len(Result), "0")
Case Is > 4
SOUNDEX = Left(Result, 4)
End Select
End If
End Function

Private Function Category(c) As String
'   Returns a Soundex code for a letter
Select Case True
Case c Like "[AEIOUY]"
Category = "/"
Case c Like "[BPFV]"
Category = "1"
Case c Like "[CSKGJQXZ]"
Category = "2"
Case c Like "[DT]"
Category = "3"
Case c = "L"
Category = "4"
Case c Like "[MN]"
Category = "5"
Case c = "R"
Category = "6"
Case Else 'This includes H and W, spaces, punctuation, etc.
Category = ""
End Select
End Function

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