Boy would they ever. I just read those SPN/Grimm fics. Oh my. It’s an interesting idea and I might read more if there’s ever more. But you’re right, they would clash so much. Especially Dean and Nick. Oh my, I can just see it. But it would be rather amusing.

Right? Can you just imagine Nick trying to explain to Dean “if it’s supernatural we kill it” Winchester that he protects a lot of the Wesen he comes across? Or that to date, his social circle consists of his BFF the blutbad, whose wife is a fuchsbau, and their families…along with a couple of repeatedly-enspelled humans, an eisbieber, his boss the half-zauberbiest, and another grimm. And that he’s currently mourning the deaths of his grimm mother and accidental hexenbiest girlfriend while awaiting the birth of his child by another hexenbiest.

Just…picture the look on Dean’s face for a minute.

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.

Does Monroe even have a name other than Monroe? I mean, didn’t even his parents call him Monroe? I can’t remember.

They’ve never explicitly told us what Monroe’s other name is. We’re not even completely certain whether Monroe is a first name or a last name, although his parents calling him Monroe certainly seems to suggest it’s his first.

Which means not only do we not know Monroe’s last name, if Rosalee took his name when they got married we now have no idea what her last name is, either!

The whole “Eddie Monroe” thing goes back to the very start of Grimm fandom. There was some kind of behind-the-scenes feature in which his name was referenced as Eddie, but both the writers and Silas have since said that it is not canon, it was never canon…it was something a producer did for some strange reason.

As far as anyone but The Powers That Be (and his parents, I guess) know, he’s just Monroe.