So, as stated here you can certify against ISO/IEC 27001 only. But why certify? Here are some reasons provided by certification bodies.
Certification finds no basis in legislative or regulatory requirement, so why bother? The best answer is to validate that investment in security controls meets business goals and provides business value. Business value is found in managing business risk, achieving high levels of legislative and regulatory compliance, and managing vulnerabilities and threats. The ISO security standards provide a disciplined approach to information security, business risk management, and compliance management. Certification provides an independent validation that the organization has applied that discipline effectively and proves due diligence on the part of executives and management, that they are addressing the information security needs of
the organization.