I was wondering the same thing!

After a heated debate we determined that we both prefer J&M 😂 thank you for asking!

LOL. I thought the same thing, but this was just physical cards at the event itself.

Made in Excel -

I over-analyzed how to word my husband's (J) and my (M) name on invitations and was interested to see which order our guests preferred... ("J&M" or "M&J")

The counts above are how guests wrote our names on the cards we received.

At first glance it looked like "M&J" was more common, but when divided by who the guest was related to, found that folks used that name first. (J's Guests used "J&M"; M's Guests used "M&J").

Edit: Wording to clarify