Walter Block has one.
Murray Rothbard had one.
Bruce L. Benson has one.
Bryan Caplan has one.
Thomas DiLorenzo has one.
Hans-Hermann Hoppe has one.
Peter Leeson has one.
Robert P. Murphy has one.
Joseph Salerno has one.
Mark Thornton has one.
Not to mention the vast number of respected Austrian economists that, while not being anarcho-capitalists, were libertarians in every sense of the word. (Mises, Hayek, Schumpeter, etc)
It's also interesting to note that libertarian-minded economists that have fully absorbed the works of Mises and Hayek and Rothbard have almost without exception become Rothbardian anarcho-capitalists. Those individuals that stayed committed to Mises' minimal state vision were few, and those individuals that committed to Hayek's views were even fewer.
Now, if you were talking about personally knowing people that were anarcho-capitalists that had no degree in economics, I won't disagree with you there. Indeed, I don't know of anyone, of any economic persuasion, with a degree in economics. There may be a couple on OT, I don't recall, but your point isn't really a point at all - most people don't have degrees in economics.