Board Thread:Theories/@comment-36359677-20180728000823/@comment-1327106-20180729063416

I thought about that. The interesting thing is... he named the Jaw Titan years after he gave it to Ymir. He probably didn't have a name for it originally. Her design was done long before Marcel and Porco's, which means that when he finally named the Titan, he decided that was okay that her version didn't have a big jaw.

He could have named it the Agile Titan or something like that and stuck with a more Ymir-ish design for Marcel and Porco, but he didn't, and I suspect it's because by then he had created the Nine Titan mythology and they all needed names, and to have names, they need to be distinctive (and this is why Eren's Titan was nameless all these years and the Attack Titan's special trait is such a vague mess that people keep saying his ability is "berserking").