Rek'Sai, Udyr, and Gnar. I'm assuming that nobody will know where they got their names from just from hearing them?
Considering that the Sora/Riku generation is in school right now, 'Reksai' would be considered an odd name, but not horrible. She would probably only get bullied for it in middle school. I don't know how 'Rek' would be as a nickname, probably badass!
Udyr isn't that bad of a name to begin with. He'd have a 'unique' name on paper.
Gnar will be bullied.
Imagine how someone named
would have to explain his name, though...
"Sir, would you please spell your name?"
"I am afraid that it cannot be spelled properly in your language, sir!"
"Spell it anyway."
"It also cannot be spelled in my language, sir!"