The “M” is the beginning of a courtesy title, such as Mr., Mrs., Ms., or Miss. You simply complete it with the appropriate title and then write your name. For example, if the card says “M ______,” you might write “Mr. Alex Smith” or “Ms. Alex Smith,” depending on your preference.

When responding, remember that the RSVP is meant to tell the couple exactly who is attending. If other invited guests are listed or included on the invitation, make sure their names are clearly included with your response. However, an extra blank space does not automatically mean you can bring a guest. If you’re unsure whether a plus-one is invited, it’s always better to check with the couple rather than assume.

Wedding etiquette has also become more flexible over time. If you use a title such as Dr. or Mx., or prefer not to use a title at all, you can simply provide the name that feels appropriate to you. Many modern couples are also choosing RSVP cards with a simple “Name:” line instead of the traditional “M,” making the process more straightforward and inclusive.

Most importantly, don’t overthink it. RSVP comes from the French phrase meaning “please respond,” and the real purpose of the card is simply to help the couple plan their celebration. Fill it out clearly, respond by the requested deadline, and let the hosts know whether you’ll be joining them for their special day.