If you make a copy of a publishing style in the same subfolder as the original, the style name is listed twice on the Formats and Options page in the Publishing Wizard and in the Preview list. In order to rename the publishing style, you must modify lines in the style.resources.xml file for the appropriate language in the Lang folder for the publishing style.
In the package, open the lang folder and then the folder for the appropriate language. Open the style.resources.xml in any text editor, such as Notepad. Near the top of the file there should be a StyleName line that has the name of the style in between <Resource ID> and </Resource> codes. The StyleName controls the style name for the Publishing Wizard. For example, for the System Process style, the line looks like this:
<Resource Id="StyleName">System Process</Resource>
A separate PreviewTitle line controls the name of the style in the Preview list. This line appears a few lines below the StyleName and looks like this:
<Resource Id="PreviewTitle">System Process</Resource>
To change the name of the style that appears in the Publishing Wizard and the Preview list, edit the text between the codes for both lines. Save and close the file and save the style package.