Sydney was a hot girls' name in the 1990s, but she's arguably still cool. One of the original old man names adopted for baby girls, Sydney's popularity may be down but she's not out.

This name of the Cretan goddess of fertility is most popular now as the more melodic Ariana, but Ariadne has possibilities of its own. It first entered the US Top 1000 in 2014. The renewed interest in the name falls in line with the revival of other mythological names like Apollo and Athena. The trendy nickname Ari doesn't hurt either.

Kyrie elieson is one of the oldest religious refrains, meaning Lord, have mercy. As a first name, though, Kyrie is less a name of God and more a nickname-name that might be short for Kyra or a diminutive that stands on its own, a la Kylie. The best-known Kyrie is the male basketball player Kyrie Irving, who pronounces the first syllable to rhyme with my rather than fear. He has inspired more than 1000 baby boys to be given this name one recent year in the US, while it was given to 178 baby girls. Impressive numbers.