Dashiell originates from, de Cheil, an old French surname. In Lucenay, France, there is a Rue de Chiel, Domaine de Chiel and a Chateau de Chiel. It is an old family name. In the U.S., there are a lot of people with the Dashiell surname in Maryland, which is where Samuel Dashiell Hammett, the writer, was born.