I am afraid you cannot handle this at the moment using the wizard.
Currently the table names are based on the endpoints in the context class, i.e. if you have an IQueryable<T> Entities property on your OpenAccessContext class the corresponding table name will be set to Entities.
OpenAccess ORM Q2 2013 brings you a more powerful code generation and a unique Bulk Operations support with LINQ syntax. Check out the list of new functionality and improvements shipped with this release.