Conversation so far:
Who did Murray Rothbard marry?
Murray Rothbard married JoAnn Schumacher
When did Murray Rothbard marry JoAnn Schumacher?
Murray Rothbard married JoAnn Schumacher In 1953

Question: Why did he call her Joey?
Self-contained rewrite: Why did Murray Rothbard call JoAnn Schumacher Joey?