Cassio comes from an old Roman family name, likely connected with emptiness or hollow, later popularized in literature.
Cassio is an Italian masculine name derived from the Latin "Cassius," an ancient Roman family name whose etymology is debated but most commonly linked to the Latin "cassus," meaning hollow, empty, or vain. The gens Cassia was a distinguished plebeian family of the Roman Republic; its most famous member was Gaius Cassius Longinus, the principal architect of the conspiracy to assassinate Julius Caesar in 44 BCE. Shakespeare rendered Cassius in his play "Julius Caesar" (c.
1599) as a man of lean and hungry ambition — and in that same decade gave the Italian form Cassio a very different character in "Othello" (c. 1603), where Cassio is Othello's loyal and honorable lieutenant, a Florentine soldier whose reputation is destroyed by Iago's manipulation. The Shakespearean Cassio is, in many ways, the definitive literary bearer of the name: noble, somewhat naive, ultimately vindicated.
His portrayal as a man of genuine virtue who is nonetheless undone by circumstance gave the name a tragic, sympathetic resonance in the English literary imagination. The Italian form Cassio remained in quiet use throughout Southern Europe, particularly in Italy and Brazil, where it sits comfortably within the Romance naming tradition. In the twentieth century, Cassio gained unexpected global recognition as the name of the Japanese electronics company Casio, founded in 1946 by Kashio Tadao — a phonetic coincidence that gave the ancient name a thoroughly modern technological association. For contemporary parents, Cassio offers classical gravitas with an Italian lilt, a Shakespearean pedigree, and a sound that travels easily across linguistic borders.