Classic and elegant but with boyish charm, Theodore has become hit name in recent years, vaulting into the US Top 10 in 2021 for the first time ever and into the Top 5 in 2024. A favorite in English speaking countries, it also ranks highly across the UK and Ireland, and in Canada, New Zealand, and Australia.

One of the coolest of names, thanks to legendary jazz pianist Thelonious Sphere Monk, who inherited this Latin-sounding German name from his father. It has been used very sparingly since the 1960's, with just a sprinkling of baby boys receiving the name each year, though it's one of the unique baby names we predict will get much less unique as more parents embrace its quirky charms.

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.

See the popularity graph below for the name Theo? It's been heading straight uphill since 2010, when it hopped back onto the Top 1000 after a 60+ year absence.

Tessa is one of those golden names that's been popular but not TOO popular for several decades now. Tessa has ranked in the Top 500 in the US since 1981 but has risen only once above Number 200.

Tobias is one of a number of s-ending boys' names that are riding a wave of popularity. With its Old Testament-Dickensian feel, it's a name with a distinguished pedigree.

Tristan -- known through medieval legend and Wagnerian opera -- has a slightly wistful, touching air. This, combined with the name's popular "an" ending, makes Tristan very appealing to parents seeking a more original alternative to Christian.

A strong single-syllable surname with a joyful meaning, Tate is finding a place on more and more birth certificates.

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.

Though it has a Scandinavian ring (a la Thorfinn), Torin is in fact a multicultural choice, an occasional feature in the UK Top 1000, and given to around 150 boys in the US each year. Connected to nature, power, and astrology, it is a distinctive yet trendy sounding choice.

Thalia was one of the Three Graces in Greek mythology, and also the Muse of comedy and pastoral poetry, making this a Hellenic choice worthy of consideration.

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.

Tatum is strong, distinctive, energetic, and recommended, especially if your last name is as congenial as O'Neal. The name is now used for both genders, with the balance running about two to one in favor of the girls.

Thatcher is an open and friendly freckle-faced surname, fresher sounding than Tyler or Taylor, that dates back to the days of thatched-roof cottages. It is catching on with modern parents—it reached the US Top 1000 for the first time in 2013.

Thaddeus, a distinguished, long-neglected name, has several areas of appeal: a solid New Testament legacy, a nice antique feel, and the choice of several more modern nicknames and international variations.

Classic yet spritely, Tatiana has long been familiar and popular in Russia and Eastern Europe, though it wasn't until the 80s that it caught on in the English-speaking world. With short forms Tiana, Tati, and Tanya, it is a versatile choice that has nevertheless seen a decline in use in recent year.

Undoubtedly inspired by country singer Trace Adkins, Trace is part update on 20th century fave Tracy, and part modern word name. Derived from Tracy, it originated as a Roman name meaning "of Thracia" or as a short form of Teresa; as a word name, it's got something slightly arty about it, but outdoorsy too, along the lines of Hunter, Chase, and Wilder.

Though Tate is used almost exclusively for boys, we can see Tate as a stronger surname alternative to Kate or a clipped form of Tatum.

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.

This Scottish form of Thomas has a lot of charm, evoking images of men in plaid kilts playing the bagpipes. As for the 'ish' ending, it could either be seen as cozy and hamish, or a little wishy-washyish.