Casio is a masculine given name of Italian origin, derived from the Latin 'Cassius', meaning 'vain' or 'empty'. Despite its somewhat negative connotation, Casio has been popular throughout history and has been borne by many notable figures, such as Gaius Cassius Longinus, a Roman general who assassinated Julius Caesar. Used in literature like Shakespeare's 'Julius Caesar', the name evokes images of ancient Rome and powerful warriors, making it an excellent choice for parents seeking a strong and meaningful name for their child.