The 36-year-old mom already has two children from her previous marriage to Ryan Phillippe -– Ava, 12, and Deacon, 8. Ava, who was named for actress Ava Gardner, inspired a rise in popularity for the name. It was at number 180 on the list of most used baby names for girls when Witherspoon's daughter was born in 2000, and as of 2011 was number five with many baby name experts crediting Witherspoon's choice for the spike.
Her first son's name, Deacon, is said to be an homage to Ryan Phillippe's distant baseball player relative. While it didn't achieve the same level of name fame as Ava after Witherspoon and Phillippe picked it, Deacon no longer simply indicated a church officer -- it became a bona fide name, Nameberry points out, and now stands at number 662 on the most recent list of boys' names.
As for the new baby, the most likely reason why Witherspoon and husband Jim Toth chose Tennessee is because the actress spent her formative years in Nashville. It could also be a nod to the most famous male Tennessee -- playwright Tennessee Williams. However, Linda Rosenkrantz, co-founder of Nameberry.com, tells the Huffington Post that the name was mostly used for baby girls in the 1880s and 1890s before the playwright came on the scene.
It remains to be seen whether Witherspoon's latest selection will propel this uncommon boys' name to stardom. But even if Tennessee doesn't become a trendy pick, there is a "place name" trend in Hollywood.
"It’s a trend that had its roots starting in the late 1980s with several celebs picking names from the American West, like Austin, Dallas and Dakota, including Melanie Griffith and Don Johnson, whose now grown daughter Dakota is the star of a new sitcom. But lately the trend seems to be heating up and much more widespread," Rosenkrantz said. "Sometimes the place has real significance to the parents... Gwen Stefani and Gavin Rossdale have meaningful associations with Kingston, Jamaica. Others seem to have no personal connection to the place, as in Bronx Wentz and the two recent celebrity kid Camdens."
Celebrities, with their penchant for choosing never-heard-before monikers for their offspring, are looking far and wide for names that fit the bill.
"The current trend seems to be really exotic-sounding spots, like Morocco, Egypt and Asia, and states rather than countries or cities -- Alabama, Arizona, Indiana and yes, Tennessee."
So, baby Toth, welcome to the club. Meet the parents of your fellow kids who are on the map.
Travis Barker named his daughter <a href="http://celebritybabies.people.com/2008/12/24/happy-birthda-3/">Alabama Luella Barker</a> in 2005.
Shooter Jennings and Drea de Matteo<a href="http://observer.com/2007/11/drea-de-matteo-gives-birth-to-baby-girl/"> named their daughter Alabama Gypsy Rose in November, 2011. </a>
Everclear's Art Alexakis named his daughter<a href="http://celebritybabies.people.com/2007/11/18/art-alexakis-we/"> Arizona Star in November, 2007. </a>
Actress Lela Rochon named her daughter <a href="http://www.superiorpics.com/lela_rochon/">Asia Rochon Fuqua in 2002. </a>
Victoria and David Beckham named their son Brooklyn in 1999.
Ashlee Simpson and Pete Wentz <a href="http://www.people.com/people/article/0,,20238396,00.html">named their son Bronx</a> in 2008.
Alicia Keys and husband Swizz Beats <a href="http://today.msnbc.msn.com/id/39693801/ns/today-entertainment/t/alicia-keys-gives-birth-baby-boy/#.UGSezvnuV1M">named their son Egypt Daoud Dean in October, 2010. </a>
Rapper Game (Jayceon Terrell Taylor) named his son <a href="http://www.blackcelebkids.com/2008/06/rapper-the-game-enjoys-birthday-party-with-his-sons/">Harlem Caron Taylor in 2003. </a>
Actress Summer Phoenix and Casey Affleck <a href="http://celebritybabies.people.com/2006/09/20/indiana_affleck/">named their son Indiana August in 2004. </a>
Alec Baldwin and Kim Basinger named their daughter Ireland in 1995.
Kingston and Zuma
Gavin Rossdale and Gwen Stefani named both of their sons after places -- Kingston in 2006 and Zuma in 2008.
Leelee Sobieski <a href="http://www.people.com/people/article/0,,20331596,00.html">gave birth to Louisanna Ray Kimmel in December, 2009. </a>
Bono named his daughter Memphis Eve in 1991.
Mariah Carey and Nick Cannon named one of their twins<a href="http://www.people.com/people/article/0,,20486933,00.html"> Moroccan who was born in April, 2011. </a>
Mike Tyson's eighth son, <a href="http://www.huffingtonpost.com/2011/01/26/mike-tyson-eighth-child-morocco_n_814371.html">Morocco, was born in January, 2011. </a>
Kourtney Kardashian <a href="http://www.huffingtonpost.com/2012/07/09/penelope-scotland-kourtney-kardashian-baby-girl_n_1572027.html">gave birth to Penelope Scotland</a> in July, 2012.