SVEN: From the Scandinavian for "youth." Remember that first names should jibe with surnames. And Sven jibes best witih surnames having Scandinavian roots. Relatives: Swen, Svend, Svenson, Svensen, Swensen, Swenson. Namesake: Bo Svenson.
SWAIN: Middle English for "knight's attendant." The word "swain" is used in poetry of earlier centuries to describe a young man from the country. Relatives: Swaine, Swayne, Swayze. Namesakes: Patrick Swayze, Swains Islands (American Samoa).
SWEENEY: Irish Gaelic for "little hero." Sweeney Todd was the infamous barber of Fleet Street. Relative: Sweeny.
SYLVESTER: From the Latin for "from the forest." This name has jumped in popularity since Sly Stallone has become so familiar to moviegoers. Relatives: Silvester, Sylvestro, Silvestre, Sly, Silvanus, Silas, Syl, Sil. Namesake: "Sylvester the cat."
SYLVIA: From the Latin for "from the forest." Sylvanus was a mythological patron of woodcutters and farmers. Relatives: Silvia, Silvie, Sylvie, Silva, Sylva, Silvana, Sylvana, Zilvia. Namesakes: Sylvia Plath, Sylvia Porter.