A variant of Cosmo from Greek kosmos, meaning order, harmony, or the universe.
Kosmo reaches all the way to the Greek kosmos — one of the most ambitious words human beings have ever coined. Kosmos meant, simultaneously, order, beauty, and the universe itself: the ancient Greeks saw these three as inseparable. From it came cosmetic (the art of ordering appearance), cosmopolitan (citizen of the ordered world), and cosmology (the study of universal structure).
To name a child Kosmo is to bless them with that entire philosophical inheritance. The anglicized form Cosmo is the name of Saints Cosmas and Damian, the twin physician-martyrs of the early Christian church who became patron saints of doctors and pharmacists. Cosimo de' Medici, the 15th-century Florentine banker and arts patron who made his family dynasty synonymous with Renaissance culture, bore the name's Italian form.
In English literary culture, Cosmo appears in Trollope and other Victorian novelists as a name of gentle eccentricity and intellectual aspiration. The Kosmo spelling, with its 'K,' gives the name a continental European or Central Asian feel — closer to the Greek original's phonology and used across German, Slavic, and Greek-speaking cultures. In the early 21st century, Cosmo and Kosmo both benefit from the fashion for short, bold, cosmic-feeling names (Orion, Atlas, Juno) that position children as citizens of the universe. Kosmo in particular has an almost retro-futurist quality: simultaneously ancient Greek philosophy and 1960s space-race optimism.