What is a name of muculine duchess?

There is no known historical or fictional "muculine duchess." The term "muculine" doesn't seem to be a real word or a commonly used term.

It's possible you're looking for a specific term related to:

* A muscular duchess: There might be a historical figure or fictional character that was known for her strength or athleticism.

* A masculine duchess: This could refer to a duchess who displayed traits that were traditionally associated with men, such as leadership or assertiveness.

If you could provide more context about what you're looking for, I might be able to help you find a name.