zolla's list "Girl and boy - F" of 3 great name ideas: Fabian - Flavia!

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.
 The name was brought to England by the French around the sixteenth century. Except for a few scattered earlier appearances, Fabian has been solidly on the U.S. pop list since 1959. It is a particularly <a href="https://nameberry.com/popular-names">popular name</a> in the Latino community and even more well used in several other countries, including Austria, Chile, and Poland. Fabiano is an attractive <a href="https://nameberry.com/baby-names/506/italian-names-for-boys">Italian name for boys</a>.

Fabian

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.
 
Fiona is the best known of a group of related Gaelic names, which is ironic because it's the only one without genuine traditional roots — it was found first in James Macpherson's Ossianic poems and then popularized in the late nineteenth century as a feminine pseudonym for William Sharp, a Scottish male writer. <a href="https://twitter.com/HJosephineGiles/status/1555216419721297922">Some researchers believe</a> that Fiona Macleod was Sharp's identity as a trans woman.
 
Its recent spike in popularity owes much to singer Fiona Apple and also possibly to Princess Fiona in Shrek. In fact, there have been numerous Fionas on the big and small screens, from The Thorn Birds to Josie and the Pussycats, Four Weddings and a Funeral to Nurse Jackie to Shameless.
 
Jennie Garth and Chad Lowe have daughters named Fiona. It's also Julia Roberts' middle name.
 
If you're looking for something more authentic, consider Fionnuala.

Fiona

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.

Girl and boy - F

The names

Fabian

Fiona

Flavia