When you concatenate, your are adding these fields to your table called NAME.
You can try this:
noConcatenate LOAD A AS "FIELD1",
B AS "FIELD2",
C AS "FIELD3"
Then you will have two tables: NAME and MY_NEW_TABLE_NAME but if they have the same field names you will have a synthetic table
Naming a table is up to you to name the table with name relevant to the data you're loading. i.e. if you are loading Customer data, it make sense to name the table Customer or CUST. So if you're concatenate you just copy same table name above and paste it into the concatenate open and close bracket.