Base Name field (Name Pages tool)
Use this area of the Name Pages and Name Pages On Background tools to enter a common name for all pages. The text in you enter will be the first part of every page name.
If you leave the name extension blank, all pages in the selected range (or on the selected background) are named identically with the base name.
If you add a name extension, pages are named uniquely by incrementing the extension and appending it to the base name.
If the base name is scriptPage and the extension is 1, pages in the selected range are named: