No, I've only heard of libertarianism in the context of America. The people I know call themselves anarchists. I don't have much knowledge about anarchism so I don't know if there's different flavors of it. Like I've heard of anarcho-communism which must be fundamentally quite different. Based on the conversations I've had with them, my own understanding was that the idea would be almost like Laissez-faire, but even more extreme since there's no government at all.