THEOPHILUS: From the Greek for "beloved of God." Namesake: "Theophilus North."
THERESA: Greek for "reaper." No matter how you spell it, this is an exquisite name with an assortment of nickname possibilities. Relatives: Teresa, Teressa, Therese, Toireasa, Teri, Terri, Terry, Tessa, Tess, Tessie, Tessy, Tracey, Tracie, Tracy, Tressa, Thera. Namesakes: Saint Theresa, Mother Teresa, Tracy, Chapman, Tracey Ullman, Teri Garr.
THIRZA: From the Hebrew for "sweet-natured" or "cypress tree." The "h" is silent, giving this name a melodic sound. Relatives: Thyrza, Tirza.
THISBE: From the Greek place name for "where the doves live." Rhymes with the flying disk. Namesake: Pyramus and Thisbe.
THOMAS: From the Greek for "twin." Tom is terrific. Relatives: Tomas, Tomaso, Tom, Thom, Thos, Tommy, Thompson, Thomson, Massey. Namesakes: Saint Thomas, Thomas Jefferson, Thomas Wolfe, Dylan Thomas, Tom Selleck, "Tom Thumb," Thom Gunn, Tom Cruise.
THOMASA: From the Greek for "twin" and a feminine variation of Thomas. Tamsin might be the prettiest choice from this group. Relatives: Thomasina, Thomasine, Tomasina, Tommie, Tommy, Tammy, Tamsen, Tamsin, Tamson. Namesake: "Thomasina."
THOR: Old Norse for "thunder." Thor was the Norse equivalent of Zeus -- the god of war who was often depicted as tossing lightning bolts. Relatives: Thora, Thorbert, Thordis, Thordia. Namesakes: Thor Heyerdahl, Thorstein Veblen.
THORNE: Old English for "thorn tree." This baby may be nicknamed Spike, so think this one through. Relatives: Thorn, Thorndyke Thornton, Thornley.