You have to break some eggs to make an omelet and, according to a lawsuit from the maker of Hellmann’s, the same goes for mayonnaise. The food company Unilever is suing a California company that uses the word “Mayo” in its sandwich spread name, saying that federal regulators and dictionaries define mayonnaise as a spread that contains eggs.The suit claims false advertising by the company Hampton Creek for labeling its egg-free product “Just Mayo.” Unilever says in a complaint filed in federal court that the word “mayo” implies that the product is mayonnaise, and Just Mayo is “stealing market share...