Rename a custom cell style in Excel 2007

To rename a custom cell style, perform the following steps:

1. On the Home tab, in the Styles group, click Cell Styles.
2. Under Custom, right click on any style and click Modify...
3. In the Style dialog box, in the Style name: box, rename the cell style.
4. Click OK to close the Style dialog box.

Note:
You cannot rename the built-in cell styles.