Sienna has been a Top 100 choice in England & Wales since 2005, the year after Sienna Miller's acting breakthrough in the hit movies Alfie and Layer Cake. In the US, it also got a big boost in the early noughties, before dropping slightly then rebounding to reach an all-time high in 2022.

Best known as the beautiful heroine to whom Cyrano de Bergerac says, "Your name is like a golden bell".

Peaking at #9 in 1982, Crystal's popularity in the 70s and 80s stems from its sparkling natural namesake and several notable bearers, like country music singer Crystal Gayle and Dynasty character Krystle Carrington. But it has since lost some of its luster for American parents, now ranking in the mid-600s. Ruby, Gemma and Pearl are fashionable alternatives, but nowadays Crystal could actually be a more unexpected choice for your little gem.

Extreme makeover: Brooklyn has gone from jokey Borough Boy name in the 1990s to a leading girls' name starting with B. The status of New York's Brooklyn as hipster heaven is ironic as few bona fide Brooklyn hipsters would choose this name.

Alexa was a steadily popular modern classic until Amazon's virtual assistant Alexa was released in 2013. It remains relatively well used in the US despite this, though its standing keeps dropping for obvious reasons. Too bad, because it's a strong and pretty name (which is probably why Amazon used it.)

This variation is actually more popular in the United States than the original Spanish Reina.

A unisex name with lots of flair and a daring spirit, Adair was first noticed as a girl's name in the 1980's, thanks to the long-running daytime drama Search for Tomorrow, with the character Adair McCleary, who had ahead-of-their-time brothers named brothers Hogan, Cagney and Quinn. Given to just 22 girls in a recent year (along with 59 boys), it remains a familiar but quietly used choice.