Quick answer
Cosmo is a boy name.
Pronunciation: Italian /ˈkɔz.mo/; American English /ˈkɑz.moʊ/; British English /ˈkɒz.məʊ/.
Meaning and history
Italian variant of Cosimo. It was introduced to Britain in the 18th century by the second Scottish Duke of Gordon, who named his son and successor after his friend Cosimo III de' Medici. On the American sitcom Seinfeld (1989-1998) this was the seldom-used first name of Jerry's neighbour Kramer.
Notes and context
Usage: italian, english