TERRELL: Old English for "thunderer." Relatives: Terrill, Tirell, Terris, Tyrell, Tarrant. Namesake: Robert Terrell.
TESS: From the Greek for "fourth born." Once used as an abbreviation of Teresa, Tess has come to stand on its own. It's a sweet name. Relatives: Tessa, Tessie. Namesakes: Tess Harper, Tess of the D'Urbervilles.
THADDEAUS: From the Latin for "courageous" or "praiser." Relatives: Thaddaus, Thaddea, Thada, Taddeo, Tadeo, Tadeusz, Tadgh, Thad, Taddy, Tadda, Tad, Ted. Namesakes: an apostle, Tadeusz Kosciuszkos.
THALASSA: Greek for "from the sea." Thalasso mud wraps are a sought-after form of therapy at seaside spas. Namesake: Thalassa Cruso.
THALIA: From the Greek for "blooming." Thalia blends nicely with a flower name, making such combinations as Thalia Rose and Thalia Lily. Namesakes: one of the three Graces, the Muse of comedy.
THEA: From Greek for "goddess." An exquisite name.
THELMA: From the Greek for "nursing." Namesake: Thelma Ritter.
THEOBOLD: Old German for "the boldest." Relatives: Teoboldo, Tibalt, Tybalt, Thebault, Thibaud, Thibaut, Theo. Namesakes: "Tybalt" (character in Shakespeare's Romeo and Juliet).
THEODORA: From the Greek for "gift of God." This was rock star Keith Richards and wife Patti Hansen's choice for one of their baby girls. Relatives: Theora, Theda, Teodora, Theodosia, Thedora, Thera (Greek for"wild"), Tedra, Feodora, Dora, Theone, Theophania, Theophilia. Namesake: Theda Bara.
THEODORE: From the Greek for "gift of God." How Theodore Cleaver became "the Beaver" rather than Teddy is beyond us. Relatives: Theodor, Teodore, Teodoro, Teddy, Ted, Feodor, Fyodor. Namesakes: Theodore Roosevelt, Theodore Dreiser, Theodore Roethke, Ted Turner, Ted Williams, Fyodor Dostoyevsky, "Theodore the Chipmunk."