Every state is different when it comes to licenses. In Washington state where I live, it’s the last name and then below it is the first and middle names. Then in Texas they don’t even put the weight down. But the way the picture of Monroe’s license looks, it does appear Monroe is his last name. We typically don’t put commas after first names. I don’t know. Maybe Monroe just likes going by his last name. It’ll likely remain a mystery for some time.

I think canon has pretty much Jossed that tie-in photo, tbh. I mean…you have Frank and Alice (his parents) calling him Monroe. When’s the last time you met parents who called their child by his last name? That would be highly unusual.

Then you have their wedding. To be honest I think that was meant to be both a tease and a reveal, because prior to that, there was still some debate over whether Monroe was his first or last name (I mean, his parents could just be really weird right?).

But then you have the officiator at their wedding announcing them as Monroe and Rosalee…and we never get a last name. Which suggests by literally everything we know about names and weddings that we got both their first names but had the last name withheld (it also suggests that Rosalee took his last name, which means we have no idea what her last name is now as well).

So to me at least, that makes the tie-in photo explicitly non-canonical. His first name is Monroe. Will they ever tell us his last name? Well they made us wait three seasons to find out Wu’s first name and whether Monroe was even his first or last name or not…so somehow I see them drawing this little mystery out as long as they reasonably can.