Thea is a diminutive of names ending in -thea, including Dorothea, Althea, and Anthea. It is also the Anglicized spelling of Theia, the Titan of sight, goddess of light, and mother of the moon. She was the consort of Hyperion, and mother of Helios, Selene, and Eos.

Though never as popular as the name of her Bewitched mother, Samantha, Tabitha has its own quirky, magical charm. The name of a charitable woman who was restored to life by Saint Peter in the Bible, it was a popular Puritan choice. Sarah Jessica Parker and Matthew Broderick chose it for one of their twin daughters, which gave it a slight boost. Nonetheless, Tabitha remains in decline.

This hauntingly euphonious Choctaw name has re-entered the public domain, as memories of the outrageous actress Tallulah Bankhead have faded. For years, Tallulah was a name associated only with Bankhead, named for her paternal grandmother who was named after the Georgia town of Tallulah Falls.

A favorite in England and Wales where nicknames as given names are very much the norm, Tilly has the potential to catch on in the US, given its similarity to the popular Lily and Ellie and the rising stars Millie, Billie, Kallie, and Nellie.

Cosy and warm but with plenty of substance and strength, Tess is a literary diminutive that works perfectly well as a stand-alone name. Stylish in the Netherlands, it currently sits outside the Top 1000 in the US, where Tessa and Teresa are currently preferred.

Theodora is one of the most revival-worthy of the charmingly old-fashioned Victorian valentine names, softly evocative but still substantial, as is the reversed-syllable Dorothea.

This quirky British nickname-turned- real-name is most famously borne by English actress Tuppence Middleton, who was named for her mother Tina’s childhood nickname. There is also a British literary namesake in Agatha Christie’s fictional detective Tuppence Beresford, whose real name is Prudence.

Cute boyish short forms like Teddy and Frankie and Billie are in some ways a relic of the past, of the days before unisex names, when girls were given feminized versions of their father's names, but they are starting to come into their own again.

A sassy, spunky name for the bold parent who doesn't remember Mrs. Ed Norton on The Honeymooners or who's into the nicknames-as-given-names trend sweeping the UK and returning to the US.

Adding a final a to Tamar lends it a more sensual Slavic tone, making it a more popular choice than the original.

Tina, despite its petite and tinkly image, is apt these days to be replaced by the more elegant originals, Christina and Martina.It does have some strong namesakes, though, in Tina Turner (born Anna Mae), Tina Brown (born Christina), Tina Fey (born Elizabeth), and photographer Tina Barney (born Tina).

A name that feels both spiritual and trendy, Trinity surged up the charts in the early 2000s, following the release of The Matrix. In just two years, it made an impressive jump from the latter end of the charts to the US Top 100, where it remained for more than a decade.

A surprise recent hit revival with cutting-edge British, Tribeca and Malibu parents; Tillie, also spelled Tilly, is cute, frilly, and sassy all at once. Tilly is currently Number 90 on the England-Wales popularity list, joining such other Top 100 nickname names as Milly, Maisie, Kitty and Lottie. Tillie along with these other short forms transform proper names rooted in other cultures into true English names for girls.

Taylor is one of the prime unisex surnames used for girls and has also been a soap opera favorite. Taylor was in the Top 10 for the last several years of the twentieth century, so that now it tends to feel a little nineties – though Taylor Swift is keeping it in the spotlight and Tay is a charming nickname. Garth Brooks and Bryan Cranston have daughters named Taylor; Taylor Schilling portrays lead Piper Chapman in Orange is the New Black.

Thora, related to Thor, is the ancient Norse thunder goddess name that's much softer and gentler than its meaning suggests. A noted bearer is actress Thora Birch.

This feminine form of Theodosius has long been buried deep in the attic, but might be a good discovery for the parent who wants to move beyond Theodora. Vice President Aaron Burr named a daughter Theodosia ("Dear Theodosia" is a song in the smash musical Hamilton), and it was the birth name of silent screen vamp Theda Bara. Theodosia actually appeared on the US popularity lists in the 1880s and 90s.

One of the most unusual flower names, Tulip is cute but tough to pull off as a first. It has some celebrity cred via Charlie Tamara Tulip, twin daughter of Rebecca Romijn and Jerry O'Connell. It derives from Persian dulband "turban", due to the distinctive shape of the flowers.

Innocent, sincere, and bright-eyed, and as outdated as its mother name, Gertrude.

Tamar is a rich, strong Old Testament name sometimes given to girls born on the holiday of Sukkoth, as palm branches were used to make the roof of the sukkah. In the Bible, there are several Tamars, including a daughter of King David and also Absalom's daughter, who is praised for her "fair countenance".

Theda is most famous as the name of silent film vamp Theda Bara. Today most fashionable little Theodoras and Theodosias are called Thea, but Theda makes an intriguing change.