I select a range by using the following code:

Worksheets(Sheet2Name).Cells(Sheet2FirstRowNum, 1).Select
Range(Selection, Selection.End(xlDown)).Select
Range(Selection, Selection.End(xlToRight)).Select

Is there a way I can "convert" the aforementioned selected range (which can
vary) into the required R1C1 format so that I end up with something like this:

ActiveWorkbook.Names.Add Name:="Database", RefersToR1C1:= _
"=Worksheets(Sheet2Name)!R2C1:R18C11"

Any help would be greatly appreciated. Thanks.