The names for the tables are usually determined by the property names, i.e. if a Person has a List<Addresses> property called "Addresses", this will be the name of the table object made available in the Designer. However, for the "root" object, there is no such property name. Thus, you may set the table name via this property. The default value for this property is the type name of the source object or - if it is a generic type - the type name of the first generic parameter.

public string RootTableName {get; set;}

public:
property String^ RootTableName {
   String^ get();
   void set (    String^ value);
}

'Declaration
 
Public Property RootTableName As String