We’ve long been loving o-ending boys’ names like Milo and Theo, but now we’re seeing that final vowel sound becoming a solid trend for girls. Except here names with the o-ending sound don’t necessarily end in ‘o’–it may also be represented by letters ow, oh or the Frenchaux. Some prime examples: Marlowe has been a hot hit of late, and Isabeau is proving to be a more distinctive follow-up to the ubiquitous Isabel.
One of the most dramatic and exotic of the o-ending possibilities, Calypso has references to Greek mythology (check the Odyssey) and rhythmic ties to a genre of vibrant West Indian music. Though it's never been in the US Top 1000, Calypso is Number 428 on Nameberry.