The bird is Porcelain. Blue is a darker gray color without that sort of yellowish hue you can see across many of his feathers.
Where did you get him? You are correct, proper d'Uccles are bearded, but it's a bit more complicated than just that. The gene that causes bearded faces is dominant, which means that a bird only needs one copy of the gene to be bearded. That means that occasionally clean-faced individuals pop up in otherwise bearded flocks because crossing two individuals with only one beard gene together will naturally throw some clean-faced offspring.
D'Uccles and Booted bantams are very similar, but the presence and absence of a beard is not the only difference between them. Booted bantams are taller, leggier, and a bit more narrow than d'Uccles, who more closely resemble their d'Anver cousins in body type, being shorter and bulkier. This is at maturity and fully filled out, so your bird has a ways to go before you can assess these qualities properly.
To make a long post short, it really depends on who you ask, and where the bird originated. If this bird hatched from a d'Uccle flock, technically he is still a d'Uccle, just one that has the major fault of lacking the beard gene.