Possible Clues:

• Ryan of "When Harry Met Sally"
• Tilly of Tinseltown
• Eldest of an Alcott quartet
• Actress Ryan of "Courage Under Fire"
• Foster or Tilly of Hollywood
• Tiny part of a hard drive
• Tom's "Sleepless in Seattle" co-star
• ''Little Women'' girl
• Eldest March sister, in a 19th-century novel
• Ryan who made out with Billy Crystal