STORM: From the Old English for "tempest." An appropriate name for a child born in the middle of one. Relatives: Storme, Stormy, Stormie. Namesakes: Storm Field, "Stormy," "Stormy Weather."
STROUD: Old English for "from the thicket." Relatives: Stroude, Stod. Namesakes: Don Stroud, Robert Stroud (the Birdman of Alcatraz).
SULLIVAN: Irish Gaelic for "black eyes." Sullivan is much more popular as a surname but makes a nice first name, too. Relatives: Sullyvan, Sully. Namesakes: John L. Sullivan, Ed Sullivan, Susan Sullivan.
SUMNER: Middle English for "summoner." Relatives: Sumenor, Sumnor, Summer. Namesakes: Sumner Welles, James Sumner, Gordon Sumner (aka Sting.)
SUNNY: From the English for "bright disposition" or "cheerful." Relatives: Sunnie, Sunnee, Sonny, Sunday. Namesakes: Sunny von Bulow, Sonny Bono.
SUSAN: From the Hebrew for "lily." Susan has been a persistently favorite choice in the twentieth century. The more traditional Susannah is particularly melodic. Relatives: Susanne, Suisan, Susanna, Susannah, Suzanne, Suzanna, Shoshannah, Sosana, Susette, Suzette, Sue Anne, Sue Ellen, Susy, Susie, Soos, Suzy, Suzie, Soozie, Sue, Suki ("beloved" in Japanese), Sukie, Sukey, Zsa Zsa. Namesakes Saint Susanna, Susan Sontag, Susan B. Anthony, Suzanne Somers, Zsa Zsa Gabor, crepes suzette, Suzy Q, "Oh, Susannah."
SUTHERLAND: Old Norse for "people from the south land" and a clan name. It would be safe to assume that, for Norwegians, everyone they encountered was from the south. Relatives: Sutton, Sutcliff, Suffield, Sundy. Namesakes: Donald Sutherland, Joan Sutherland, Rick Sutcliff, Sutton Place (N.Y.)