Baby naming trends change all the time. Learn about different baby names and history while testing your knowledge with the baby naming trend quiz.
In 2009, more than 22,000 baby girls were named Isabella.
Emily may have held the title of most popular name for baby girls for more than a decade, but Emma and Isabella's recent increase in popularity has moved Emily down the list -- ranked third place in 2008 and sixth in 2009.
While Jacob has been the most popular name for baby boys born in America since 1999, Ethan, Michael, Alexander and William are no slouches. And Joshua, we're watching for you to crack the top five in 2010.
Parents inspired by the eldest first daughter, Malia Obama, helped increase the popularity of the name. Maliyah jumped from ranking 638 in 2008 to 296 in 2009, and the alternative spelling 'Malia' also had a big jump from 2008 to 2009, from ranking 345 to 192.
The Social Security Administration began compiling lists of baby names in 1997 but they've collected data on all births after 1879. The most popular names at the close of 19th century America were John and Mary.
Elvis fans are everywhere, including at the Social Security Commission. Commissioner Michael Astrue gives an annual update on the popularity of the name Elvis, and although Presley comes in at number 268 (for girls), the name Elvis is slipping, falling from 713 in 2008 to 858 in 2009 (for boys).
Although trends often spread across the country, the popularity of names can vary from state to state. While Isabella may be the most popular name in the country (and in California and New York) for 2009, Michael outpaced Daniel in New York.
Jennifer is the most common name for Gen X females; Amy, Lisa, Michelle, Melissa and Jessica are pretty common, too.
Although it ranked 102 in 2009, Mary has been the most popular name for baby girls 46 times in the last 100 years. James, by comparison, has been in the top 5 names for baby boys for more than 80 years.
Michael held the number one position in most popular boy names from 1954 until Jacob rose to the occasion in 1999 (with one exception when Michael slipped from first to second in 1960 when David took most popular that year).
According to stats by the Social Security Administration, 3.7 percent of boy babies are given names that rhyme with "maiden," including Aiden, Jayden, Caden and Zayden.
While biblical names such as Mary consistently rank high in popularity, names that reflect spiritual concepts are growing in popularity. Nevaeh, the word 'heaven' spelled backward, ranked number 34 in 2009. Heaven ranked number 275, and for boys, the name Messiah came in at number 663.
While the name Bo is positioned at the lower end of the top 1,000 baby names of 2009 (number 782), Charlie, Heidi and Rex all fare better, ranking 274, 297 and 752 respectively.
A 2004 study conducted by researchers at Harvard University and the University of Chicago found that more than 40 percent of African-American baby girls born in the last 20 years have names that are distinct from white girls (no white babies were given those names during that same period of time).
Whether you spell it Aiden, Aaden, Aden, Ayden or Aidan (or another way), Aiden is one of the most popular names for American boys born between 1995 and 2009. While the spelling 'Aiden' ranks 12 in popularity in 2009, combined with the other spellings, it has named more babies than Jacob in the last decade.
Names beginning with the letter 'L' have become fashionable for baby girls born in the last decade, including Lily, Lillian, Leah and London.
While Irish names (such as Connor) for American baby boys are trendy, in Ireland, parents are trending toward globally common names (such as James and Emma, which are popular in America).
If the Emily versus Emma battle for the number 1 most popular baby girl name is any indication -- and it is -- names beginning with the letter 'E' are hot, for both boys and girls: Emily, Emma, Ella, Esme, Ethan, and the list goes on.
The popularity of names comes and goes over the years, and many names that were popular 100 years ago are scarce today. While some names, like John, stand the test of time, Walter -- ranking in at 387 -- is an example of a retro name that has yet to make a comeback.
While Isabella, Emma, Jacob and Ethan are the most popular baby names in 2009, their popularity doesn't hold up when it comes to naming twins. The most popular names for male/female twins born in 2009 are Mason and Madison. For single births, Mason ranks 34 while Madison ranks 7.