The most popular baby names: Welcome back, Jacob. So long, Elvis.

What are the chances your baby will have several friends with the same name once they go to school? It's very likely, particularly if your child is named Isabella, Jacob, or even Maci. But if your little one is named after Elvis, for the first time in more than a half-century, he probably won't encounter another similarly named friend.

With its release of the most popular baby names of 2010, the Social Security Administration reveals that names that have topped the list consistently for several years are joined by some new and surprisingly trendy choices, such as reality TV star names. The administration also notes that some names we've been used to finding at the top dropped a few spots last year.

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"The chances of meeting a baby named Sophia this year versus last year -- you'll see them everywhere," saysLaura Wattenberg, author of "The Baby Name Wizard: A Magical Method for Finding the Perfect Name for Your Baby".