another option
Code:
Sub saveProgressiveNumber1()
    Dim newFileName As String, strPath As String
    Dim strFileName As String, strExt As String
    strPath = "C:\Users\ivan\Desktop\" 'Change to suit
    strFileName = "Ivan Ivanov"
    strExt = ".xlsm" 'Change to suit
    newFileName = strFileName & "-" & GetNewSuffix(strPath, strFileName, strExt) & strExt
    ActiveWorkbook.SaveCopyAs strPath & newFileName
End Sub
 
Function GetNewSuffix(ByVal strPath As String, ByVal strName As String, ByVal strExt As String) As Integer
    Dim strFile As String, strSuffix As String, intMax As Integer
    strFile = Dir(strPath & "\" & strName & "*")
    Do While strFile <> ""
        strSuffix = Mid(strFile, Len(strName) + 2, Len(strFile) - Len(strName) - Len(strExt) - 1)
        If Mid(strFile, Len(strName) + 1, 1) = "-" And CSng(strSuffix) >= 0 And _
        InStr(1, strSuffix, ",") = 0 And InStr(1, strSuffix, ".") = 0 Then
            If CInt(strSuffix) >= intMax Then intMax = CInt(strSuffix)
        End If
        strFile = Dir
    Loop
    GetNewSuffix = intMax + 1
End Function