Hi stama100, I made a simple script for you to refine, that might do the trick. 
Private Sub Workbook_Open()
On Error GoTo Fin
Dim strName As String, FileName As String
Dim wbFileFormat As String
Select Case ThisWorkbook.FileFormat
Case 56
wbFileFormat = ".xls"
Case 51
wbFileFormat = ".xlsx"
Case 52
wbFileFormat = ".xlsm"
End Select
FileName = Replace(ThisWorkbook.Name, wbFileFormat, "")
strName = InputBox(Prompt:="Enter cell value (e.g. Joe)", Title:="Save name", Default:="Name")
If strName = vbNullString Then Exit Sub
'Save in the worksheet you want, although not needed here
Worksheet("Sheet1").Range("A1").Value = strName
ThisWorkbook.SaveAs (FileName & " " & strName & wbFileFormat)
Fin:
End Sub
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