Since the data table references are stored in a list, you can send the << Get Name message to the list and it will distribute the send to each item. The result is a new list of the names.
Names Default To Here( 1 );
Open( "$SAMPLE_DATA/Big Class.jmp" );
Open( "$SAMPLE_DATA/Cars.jmp" );
table = Get Data Table List();
name = table << Get Name;
Lists and matrices offer the opportunity to 'vectorize' operations by allowing functions and messages to work on the collection as a whole without the need for explicit iteration in JSL.