You can rename an index as long as index names are unique within the table. For example, two tables can have an index named XPK_1, but the same table could not have two indexes named XPK_1. Renaming an index only changes the name of the index; the index is not rebuilt.
Note When you create a PRIMARY KEY or UNIQUE constraint on a table, an index with the same name as the constraint is automatically created for the table. Because index names must be unique for a table, you cannot create or rename an index to have the same name as the PRIMARY KEY or UNIQUE constraint for the table.
To rename an index
To modify an index