Hanzou
Grandmaster
Because Judo is considered a "hard and practical" art in MMA. In the "Karate vs Muay Thai kicks, fan confusion" example, Judo is the Muay thai. People are going to attribute aikido in the cage as Judo simply because it's what they know and think highly of.
So is Bjj. People can still tell the difference between Bjj and Judo, despite them being related styles.
Fans already do it with striking, they'd do the same thing with grappling
Again, if someone popped up on the MMA scene tossing people around with Aikido, no one would be confused about what they do. Aikido throws look quite a bit different than Judo or wrestling throws.