I got a workbook with a lot of named ranges. They are named
range1, range2, range3, range4 .....range40.

Is it possible to ADD a ZERO before the SINGLE digit named
ranges (using VBA) so that they look like as follows: range01,
range02, ...range09 ... . Ranges named range10, range11 ....
range40 etc. are to be left untouched.

I would do it like this...

Sub FillOutRangeNames()
Dim N As Name
For Each N In ThisWorkbook.Names
If UCase(N.Name) Like "RANGE#" Then
N.Name = "Range" & Format(Right(N.Name, 1), "00")
End If
Next
End Sub

Rick Rothstein (MVP - Excel)