AFAIK a DBA (Doing business as) needs to be for the target market, not for the place of the business. If I'm wrong, that's that.
If I'm correct, then how would one who is selling over the internet to (almost) anywhere in the world go about using a DBA?
I tagged this question "United-States" but that's only assuming the business is located there and since perhaps this matters. But the question is, as mentioned, about the DBA.