Use the Rename command to change the names associated with Blocks, Layers, LineStyles, RichLineStyles, TextStyles, TableStyles, DimensionStyles, Custom Coordinate Systems, and views.
For certain drawing entities, standard items cannot be renamed or deleted because the drawing for these types must contain at least one basic item, including the:
To rename styles and drawing elements:
The dialog box displays all items defined in the drawing.
Access
Command: Rename
Menu: Format > Rename
Parent Topic