Is there a particular type of group you are trying to attract? In my opinion, I don’t think changing the name to a sexier one will do the trick. The term “sexy” has different meaning and appealing to different people. If you change the name to something sexier, then you might also attract the wrong types as well. Maybe you need a better way of promoting your class without changing the name. If the concept and theme of your class are going to be the same, then changing the name will not do you much good. What if the people who are participating in the class right now don’t like the new name and you end up losing some of them, would it still worth it? Maybe you need to come up with a new class with a new name for it instead of renaming your existing class.