"Muse" is generally a feminine noun, and it doesn't typically have a masculine counterpart.
However, depending on the context, you could use alternative words that convey a similar meaning:
* Inspirer: This is a more neutral term that can be used for both men and women.
* Patron: This term is often used for a wealthy or powerful person who supports an artist or creative endeavor.
* Mentor: This term is used for someone who guides and advises someone else, often in a creative or intellectual field.
Ultimately, the best word to use depends on the specific situation and the desired nuance.