Hillary Clinton has been in the spotlight for two decades, so why did her lovely, lively name just now catapult up the charts an astonishing 3,000 percent? Maybe Hillary’s softer turn last summer as mother of the bride made people better able to appreciate her name’s upbeat merits: It means “happy,” after all. And maybe it’s just taken this long for the name to shake loose from its connection to Ms. Clinton. After nearly nose-diving off the Top 1,000 in 2006, its star is once again heading straight up.