They're cute! Sometimes breeders throw in extras in case some eggs crack during shipping. Strange it's not the same breed. Perhaps you could name it Extra, Bonus, Mistake, Error, etc. You'll probably have as much fun with that one as all the rest. Congrats!
Thanks we named it PECKER as it spent the first day running around and pecking the feet of every chick for hours. They were all crying and squealing. Finally he went into solitary for most of the day and when it put it back in the brooder i gave them crumbled egg yolk and olenty if food and he seems to have cut down in his foot obsession a little bit!