What did you name your Chocobo?

[Allegor]

Kiwi, because while trying to dye his feathers red I accidentally made him green and the joke name stayed.

Also

Selene coz I dunno

But now I regret the name and want her to be named either fried chicken or mcchickenugget tho names can't be changed on chocobos.

You can, go back to the stable you got him from (or any stable?) and ask the chocobokeep.