Exactly!As @ronott1 said, there are two kinds of BCMs. The French type with feathered shanks and a clean legged version which is the standard here in the UK, so if they are feather legged then it is correct to call them French Black Copper Marans. You can also get the clean legged variety in the USA and they are just Black Copper Marans.
As regards the sex of this chick, it is still too early to say for sure but nothing to indicate it is a cockerel at this stage.
BCM and FBCM is used incorrectly so much that it is a good idea to make sure you are getting the type you want. Ask, do they have feathered shanks?
Good breeders will know the correct usage but others not so much