It's actually how the term was originally coined - the first person to identify as an incel was a woman. Perhaps without the "radical" adjective, though.

As a brother of two sisters I would say that (unsurprisingly) the proportion of incels is the same in both sexes, they just express it differently. Women incels are not nearly as visible, but they're there.

One thing they do have in common though is a tendency to get fixated on someone/something, so they're over represented in IT.