I sort of wish it were, but I think only one or two people use it. The problem is that it's not really anything like old-style rationalism and so calling it neorationalism is misleading. 'Bayesianism' is normally taken to be the philosophy, 'rationalist' the adherent. Unfortunately, rationality is more than just Bayesianism, so that too is inaccurate. The whole lack of an -ism thing is kind of a downer. 'Evidentialism' or something might work as a description of our epistemology but it fails to connect to the 'winning' part of rationality. Bayesian decision theory-ism is what we're trying to achieve, I think, but we need something more aesthetic. Suggestions?