Onymously

But divulge it to Mrs. Rick I must and will—anonymously or onymously.

Source: wiktionary

Article is clearly by —, and he anonymously or onymously is not worth powder and shot.

Source: wiktionary

But whether or not you order the book, you’ll write us on the Doormat Theory, won’t you, onymously or anonymously, as you choose. We’ll respect your confidence. Thank you.

Source: wiktionary

At one and the same time, the same person might well be in favour of discursive anonymity in the case of a text like the Dialogues Concerning Natural Religion while declaring a social right and need to identify the author of a text such as The Garden of Fascism. Indeed, the higher ethical demand in the case of persecuted authors is not for a rearguard policy of anonymity but to ensure that an individual may write onymously without threat of reprisal: pseudonymity and dissimulation being within the grasp of most authors, the freedom to identify oneself as the author of a particular discourse is commonly assumed as a right of citizenship. To recommend anonymity per se is complicit with or at least acquiescent before the very totalitarian forces that provoke such a consideration in the first place.

Source: wiktionary