Short form of Cleopatra, from Greek 'kleos' meaning glory or fame.
Cleo is most often a shortened form of Cleopatra or Cleophus-related names, and it comes from the Greek kleos, meaning “glory,” “fame,” or “renown.” That root is a powerful one in Greek literature, where kleos names the lasting reputation won by heroes and rulers. Though Cleo is brief and modern-sounding, its linguistic ancestry is anything but slight: it belongs to an ancient vocabulary of honor, memory, and public distinction.
In some periods it has functioned as a nickname, but it has long stood independently as a given name. Its strongest cultural shadow is Cleopatra, above all Cleopatra VII of Egypt, whose story passed through Roman history, Shakespearean drama, and modern cinema until it became one of the most mythologized female identities in the world. Cleo carries a lighter, more streamlined version of that grandeur.
The name also appears in early twentieth-century records, when short, stylish names for girls began to gain ground, and it later acquired artistic and bohemian associations through performers, writers, and fictional characters. Because of Cleo de Merode, Cleo Laine, and various film and television uses, it has often suggested charisma and sophistication. Its usage has risen and fallen in cycles, but in the present era it fits neatly with the renewed popularity of short vintage names such as Cora, Thea, and Lola. Cleo now feels both antique and sleek: classical at the root, modern in shape, and touched by an aura of glamour, intelligence, and memorable self-possession.