Girl and boy - F

Fabian is the ancient name of a saint and pope that also has Shakespearean cred as Olivia's servant in Twelfth Night and more recently made an appearance in Harry Potter. In the U.S. Fabian became best known via the 1960s teen idol/singer who went solely by his first name.

Fiona entered the American consciousness with the opening of the 1954 Broadway musical Brigadoon, but didn't come onto the U.S. popularity list until 1990.

An ancient Roman clan name, Flavia is one choice that's unusual but historic. Now a Top 60 name in Italy, Flavia has been a rarity in the US, but with the upswing in F names for girls, this could change. Seen more in literature than real life, Flavia was used as far back as an1580 romance, then in a William Dean Howells novel and as a Princess in The Prisoner of Zenda. Although the original pronunciation is FLAH-via, Flavie (as in flavor) could make a cute nickname.