Nice and sweet, perhaps, but there's always a risk of kids being cruel to boys with nice and sweet names. Not saying don't name your kid Dorian, nor that a name will "cause" bullying, but just be aware that kids will look for any excuse to pick on eachother, and they'll take any material they can get. Dorian...dorkian...doris...dora...doormat...it's a potential weapon, as many names are. Also it's a unisex name, which some kids may get hung up on. This is not necessarily a point of concern, as the name itself won't make much difference.
But jerks aside, there's the matter of meaning and connotation. The name doesn't really mean anything significant unless you have some connection to the Dorian people. And the most famous person named Dorian is probably the character of Dorian Gray, a tragic figure who (according to the synopsis) makes a wish to remain young and have his portrait age in his place, so he can live a long life of hedonism, then ends up committing murder and eventually accidentally causing his own death. Not a happy story.
Again, I'm not saying don't name your kid Dorian, but maybe consider the implications. As a writer, I wouldn't name a character Dorian unless there was something messed up about to happen.