The names at the bottom of the U.S. Social Security Administration's Top 1,000 in 2009 were Trevin for boys and Lilyanna for girls. In 2008, the least popular names on the list were Damari for boys and Elianna for girls.
Other unpopular names in 2009 were Stone, Frederick, Immanuel and Nick for boys, and Bree, Camria, Gretchen and Kloe for girls. In 2008, the least popular names included Jensen, Kolten, Yurem and Carlo for boys, and Carleigh, Sky, Carrie and Diya for girls.
For more name data, the SSA website has lists of the most popular baby names each year from 1880 onward.