The closest meaning to "unanonymous" would be identified or known. It would suggest someone or something that was previously anonymous, but now has a known identity.
For example, you could say:
* "The hacker's unanonymous identity was finally revealed to be a disgruntled employee."
* "The unanonymous author of the article, who had previously chosen to remain anonymous, came forward to speak to the press."
However, it's important to note that using "unanonymous" is unusual and might sound awkward or unclear. It's generally better to use more familiar synonyms like "identified," "revealed," or "known" in your writing.