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The name of several ancient kings and princes of Ireland, Tadhg became so common at one point that it was used to represent a kind of Irish Gaelic everyman, or man in the street, as Paddy and Mick would later. Tadhg has seen a major resurgence in recent years and is also now ranked in England.

It is sometimes used as the Irish equivalent of Timothy and is also anglicized as Teague and Thaddeus. Tadleigh and Thad are pet forms. Pronunciation is like tide ending with a g or like the first syllable of tiger.

Tailor is a masculine occupational name derived from the profession of tailoring—creating and altering clothing. While traditionally used as a surname (often spelled Taylor), its use as a first name represents the modern trend of adopting occupational surnames as given names. The spelling variation with 'i' instead of 'y' gives the name a more literal connection to the craft while distinguishing it slightly from the more common Taylor, which has become popular for both boys and girls. Tailor evokes imagery of precision, craftsmanship, and attention to detail. Though less common than Taylor as a first name, Tailor maintains the same approachable, unpretentious quality with a subtle twist in spelling that some parents might find appealing for its uniqueness while remaining familiar and easy to pronounce.

Teodora is an extremely attractive and international choice, with several equally attractive, user-friendly nicknames. Appealing short forms might include Tea, Dora, or Dory for English speakers, however, classic diminutives include the Spanish, Italian, Serbian and Portuguese Dora, the Bulgarian Todorka, and the Swedish Thea.

In the Plymouth Colony of the seventeenth century, Thankful was the third most popular of the abstract word names. It disappeared after 1700 and has virtually no chance of returning.

One of the coolest of names, thanks to legendary jazz pianist Thelonious Sphere Monk, who inherited it from his father. It has been used very sparingly since the 1960s--just a sprinkling of baby boys receive the name each year. Monk's middle name Sphere is pretty unique too--a cousin of Cosmos and Cosmo. Some other jazz names to consider: Bix, Ellington, Ella, Etta, Mingus, Dexter and Calloway. :

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.

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.

Creative choice, evoking the high-kicking can-can girls and other colorful figures in the works of Toulouse-Lautrec.

A wonderful Yiddish diminutive of Sarah, most familiar to Americans as the name of Tevye’s eldest daughter in Joseph Stein’s Fiddler on the Roof.

Biblical wife of Moses whose name has many variations, with and without the initial T and final h, with one p or two. However you spell it, it's an original choice that also carries teasing potential; those zipper jokes will get old fast, though Zippy is a cute nickname.