SEAN: Irish form of John. This name has become so popular (for girls as well as boys) that it no longer seems distinctly Irish. Relatives: Shawn, Shaun, Shawna, Shaune, Sian. Namesakes: Sean O'Casey, Sean Connery, Sean Penn, Sean Young.
SEASON: From the Latin for "planting time." Spring, Summer, and Winter work well, so why not consider Season? Namesake: Season Hubley.
SEATON: Old Anglo-French for "from Baron's estate" and English for "sea town." Relatives: Seeton, Seton, Seetin. Namesakes: Elizabeth Seton, Ernest Thompson Seton, Seton Hall.
SEBASTIAN: From the Latin for "revered one." Sebastian is the patron saint of archers and pin makers. This is a superb name and worthy of a comeback. Relatives: Sebastiane, Sebastianne, Sebastiana, Sebastien, Sebastiona, Bastien, Bastian. Namesakes: Saint Sebastian, Sebastian Cabot, John Sebastian, "Sebastian Flyte."
SELBY: Old English for "of the manor house farm." Think about this for a girl. Relatives: Selden, Seldon, Selwin, Selwyn.
SELENA: From Greek for "moon." Selena is an ancient, mythological name for the goddess of the moon. Relatives: Selina, Selene, Selinda, Selly, Sellie, Sela, Selia, Sena, Celena, Celina, Celene, Celie, Celia. Namesake: Selina, Countess of Huntingdon.
SENNETT: From the French for "wise one." This could be interpreted as akin to naming your child Congress or President. Then again, why not? Relatives: Senet, Senta. Namesakes: Mack Sennett, Senta Berger.
SEPTIMA: From the Latin for "seventh born." If you have six already, celebrate with this enchanting name. Relatives: Septimus, Seven. Namesake: Lilibet Septima.