| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1821 | Theodora | Latin | God given. Feminine of Theodore. | F | |
| 1822 | Theophania | Latin | Manifestation of God. In the Middle Ages, this name was sometimes given to girls born on Twelfth night. | F | |
| 1823 | Tiberia | Latin | From the Tiber. | F | |
| 1824 | Tierra | Latin | Headdress. A tiara is a jeweled headpiece or demi-crown. | F | |
| 1825 | Tiffany | Latin | Variant of Theophania: Manifestation of God. In the Middle Ages, this name was sometimes given to girls born on Twelfth night. | F | |
| 1826 | Tigris | Latin | From the Tigris. | F | |
| 1827 | Tigrisa | Latin | From the Tigris. | F | |
| 1828 | Tigrisia | Latin | From the Tigris. | F | |
| 1829 | Timandra | Latin | Sister of Helen. | F | |
| 1830 | Tina | Latin | Name ending used as an independent name and in combination with other names i.e. Tinamarie. | F | |
| 1831 | Tiryns | Latin | Aunt of Hercules. | F | |
| 1832 | Tisha | Latin | Diminutive of Letitia: Joy. | F | |
| 1833 | Tita | Latin | Honored. | F | |
| 1834 | Toinette | Latin | Praiseworthy. | F | |
| 1835 | Tonia | Latin | Praiseworthy. | F | |
| 1836 | Topaz | Latin | Jewel. | F | |
| 1837 | Tricia | Latin | Diminutive of Patricia: Noble. St. Patricia was a 7th century patron saint of Naples. | F | |
| 1838 | Trinity | Latin | Three in one. | F | |
| 1839 | Trish | Latin | Diminutive of Patricia: Noble. St. Patricia was a 7th century patron saint of Naples. | F | |
| 1840 | Trisha | Latin | Diminutive of Patricia: Noble. St. Patricia was a 7th century patron saint of Naples. | F | |