score:7
The State Department's "Sample" DS-160 contains this question:
Since you apparently have used another name, you should answer "Yes" to this question. Because I'm not actually filling out the documents (and haven't done so, in the past), I don't know what happens next...but a new question or two may then be shown, asking you to state the name(s), and, perhaps, for what purpose or under what circumstances. If new questions appear on this topic, you should answer them truthfully as well.
None of us know what information about you is known by the Department of State. If in response to a question you don't disclose something State already knows, your application will be denied for dishonesty or misrepresentation.