Consistent with MIT’s diploma format, your certificate(s) will list your full name only. You may include a middle name or initial. If you are a "Jr." or a "III", that is considered part of your name, so it may be included. But other than that, nothing else; nothing before your name (no rank, no honorific, no courtesy title) and nothing after your name (no academic or any other kind of post-nominals abbreviation for an honor or professional membership). Inscribing a certificate with just the certificate holder’s name emphasizes that the award is for the individual without reference to any office or position they might hold or have held. The honor is to them without regard to how their name might be written at a particular time in their life.