Grogu Had 2 Name Changes In The Mandalorian Season 3 (Both Were Absurd)
Although Grogu's name was changed in The Mandalorian season 3 finale, Star Wars has yet to use his full name (and probably won't going forward).
Although Grogu was renamed in The Mandalorian season 3, his full name has yet to be used and probably won't be in Star Wars' future. Becoming the officially adopted son of Din Djarin (Pedro Pascal) in the season finale, Grogu is a foundling no more. Instead, he's now a true Mandalorian apprentice. However, the new name change wasn't the first alteration Grogu received in the series.
Grogu has been colloquially referred to as "Baby Yoda" by Star Wars fans ever since his first appearance in The Mandalorian season 1. However, that's obviously never been a name used in the canon nor by the cast and crew of the live-action Star Wars show. After all, Grogu has no known connections to Master Yoda beyond their shared species and powers as Force-senstives. That being said, Grogu's new name and full title established in The Mandalorian season 3 is arguably even more ridiculous.
"Din Grogu" Is NOT The Child's Full Name After The Mandalorian Season 3
In The Mandalorian season 3, episode 8, Grogu is taken to the Living Waters following the successful reclamation of Mandalore and the defeat of Moff Gideon (Giancarlo Esposito) and his Imperial Remnant forces. There, Din Djarin officially adopts Grogu as his son which allows the child to become an official Mandalorian without speaking the creed. As such, The Armorer (Emily Swallow) renames Grogu as "Din Grogu", taking on Djarin's family name which for some reason comes before his personal name.
Compared to their fellow Mandalorians, the family name coming first is quite an unorthodox naming convention, though it was likely inspired by Japanese culture as the Mandlorians are based on real-life samurai warriors, especially Djarin himself who's largely been depicted as a ronin. Regardless, the Mandalorian's surname coming first is not the only strange part about Grogu's new name.
Grogu Being Knighted Makes His Strange Naming Conventions Even Weirder
In The Mandalorian season 3, episode 6, Grogu was knighted by the Duchess of Plazir-15 (Lizzo), having stayed with her and her husband Captain Bombardier (Jack Black) while Din Djarin and Bo-Katan Kryze (Katee Sackoff) investigated the planet's ongoing droid crisis. As such, Grogu was apparently knighted simply because the Duchess found him adorable. That said, the fact remains that Grogu's full name and title is technically "Sir Din Grogu" in the established Star Wars canon.
Grogu becoming a Knight of Plazir-15 was likely nothing more than a humorous joke rather than becoming an official new name with some sort of narrative significance going forward. After all, Grogu didn't do much of anything in the episode beyond using the Force to help the Duchess win lawn games. Even so, "Sir Din Grogu" is how the child should be addressed if someone wanted to extend full honors and formality to Din Djarin's new son and apprentice (which is inarguably bizarre).
Will Star Wars Ever Call Grogu By His Full Name and Title?
While his future is still a mystery beyond continuing his adventures with Djarin, several theories have emerged that Sir Din Grogu might become the next ruler of Mandalore, riding the mythosaur he's seen connecting with in The Mandalorian season 3's finale. Likewise, it's believed Grogu could end up joining Rey and the New Jedi Order in the announced movie following the sequel trilogy. Reportedly set 15 years after the events of The Rise of Skywalker, Grogu would be around 90 years old when and if he decides to become a Mandalorian Jedi just like Tarre Vizsla, the creator of the Darksaber.
Keeping those thoughts and theories in mind, it stands to reason that Grogu could very well gain more titles to his already unorthodox name in the future. Therefore, It seems doubtful that Lucasfilm will want to keep Grogu's initial knighthood on Plazir-15 at the forefront of fans' minds, especially if he ends up being knighted again with the New Jedi Order. The odds of future seasons of The Mandalorian actually referring to Grogu as "Sir Din Grogu" feels rather low. It's probably for the best that Grogu's knighthood is left in the past as a one-off joke in the Star Wars galaxy.