You can rename any alias table other than the Default alias table.
To rename an alias table:
Open the outline in edit mode and select the Properties tab.
Under the Alias Tables node, right-click an alias table and select Rename.
In the New name text box, enter a name.
Click OK.
“Setting Aliases” in the Oracle Essbase Database Administrator's Guide
alter object (MaxL) in the Oracle Essbase Technical Reference
renameobject (ESSCMD) in the Oracle Essbase Technical Reference