Popular baby name alert: Isabella may be knocking Emily off her throne this year.

Parents.com has announced their list of 50 Hottest Baby Names of 2008. For the second year in a row, Aidan is the top name for boys while Isabella skyrockets to #1 for the first time ever. Their list is based the names that get the most traffic on their website in the course of the year.

The official list — based on the birth certificates submitted to the Social Security Administration — has not yet been released.

Other naming trends according to parents.com:

 The end of Emily? According to the Social Security Administration, Emily has been the top name for baby girls since 1996. But it only came in third on our list for 2008, with Isabella and Ava the #1 and #2 names, suggesting that the reign of Emily might be over.

Isabella and Ava are popular names among celebs. Isabella was chosen by Tom Cruise, Nicole Kidman and Matt Damon while Reese Witherspoon and Jason Priestley went for Ava.

Presidential Baby Names: Barack Obama won the presidency - but did he also start a name trend? Malia, Michelle and Barack — which previously wasn’t even in the top 500 — all rose in popularity from 2007 to 2008 (although Sasha fell in popularity), and we see them continuing to climb the charts after the inauguration.

 Ooops She Did It Again–The Britney Comeback Effect: Parents are embracing the first and middle names Spears chose for her second son, Jayden James. Jayden is #2 and James is #7.

 The influence of TV: The boob tube can affect baby names - witness the popularity of Aidan (#1), Carrie’s loveable boyfriend on Sex and the City, or Addison (#8), the name of the Grey’s Anatomy doc who got her own spinoff, Private Practice, this year.

 Last Names as First Names That Can Be Used For Boys and Girls: Avery, Logan, Riley and Peyton are all climbing the lists. Last names as first names suggest power, prestige and tradition.

 First Timers Making the List: Aalyiah (#28) and Teagan (#44) made their debuts on the list for girl’s names. On the boy’s side, Micah (#41) and Tristan (#49) showed up on the list for the first time.

 Book it: Twilight fever has hit the baby name world too, as Edward and Bella, the names of the star-crossed lovers in Stephanie Meyer’s vampire series and now the feature film, both rose in popularity last year. Other names inspired by popular fiction are Madeline (#9) and Olivia (#10).

“M” Names: Girl names starting with “M” rank high on the list, like Madison (#6), Madeline (#9), Makayla (#19), Mia (#21), MacKenzie (#22) and Michelle (#31).

 Losing steam: Trendy boy names like Grayson took a nosedive this year, from #3 in 2007 down to #14 in 2008. Another name on the downswing? Kendall, which fell from #7 in 2007 to #45 in 2008.

To check out your name’s ranking, visit the Social Security Administration’s database.