not in the American sense, but "libertarianism" has long usage in Europe as well, where it's usually associated with 'left libertarian' thinkers such as Orwell, Kropotkin and so forth. Chomsky would be a contemporary example.
Many European anarchists describe themselves as libertarian, in the US the terminology is just not common, so people might be talking past each other here.
Bookchin has spoken about this, but I can't find the lecture at the moment. When I use "libertarian" to describe myself, it's in the Socialist/anarchist sense, rather than what I view as antithetical to libertarian (i.e concerned with the freedom of people) philosophy; I think I would rather call "libertarians" as "propertytarians", as they are so much more concerned with the ownership of property rather than individual freedom, but the name won't catch on.
Many European anarchists describe themselves as libertarian, in the US the terminology is just not common, so people might be talking past each other here.