The name of an attribute in Microsoft SQL Server Analysis Services is defined by its Name property. To rename an attribute, right-click the attribute in the Attributes pane of the Dimension Structure tab of Dimension Designer in SQL Server Data Tools (SSDT), and then click Rename. If the Attributes pane is in grid view, click the attribute's name and edit it directly in the grid. You can also select an attribute and set its Name property in the Properties window.
For more information about how to rename an attribute, see Bind an attribute to a Key column.