It shall be the duty of the Department of Public Works to object to the name of any proposed street similar to one already dedicated, unless the new street can be an extension of the latter, and also to object to any name that may be so similar as to lead to confusion. In neither case the person, firm or corporation that submitted the name or names which were objected to shall submit other names not open to the same objection, and shall not sell or offer for sale any lot or lots on such proposed streets until the names thereof have been approved by the Department of Public Works.