Well you see, TheKlabautermann, it's elementary; The name "Derek" is so mind-bogglingly mediocre and simple it is easy to forget, its simplicity leads to the man or, in this case, the creature behind the name being not one of suspect behaviour - exactly as a creature of deceit like a changeling would relish, the ability to fall into the background when needed, to be of subtle nature. Clearly the parents behind this particular young changeling are a bright bunch, I wouldn't be surprised if all the changelings were named similarly, like Bob for instance.

I mean really, It's obvious!