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Gently old-fashioned stand-alone nickname that owes its popularity to mega popular Abigail.

Substantial, strong, and enduring, Anthony has remained a perennially popular name over the last century. With just a hint of playfulness and just a touch of clunky-coolness, Anthony is a versatile choice that seems comfortable anywhere.

An Irish and Welsh form of Catherine, Caitlin was a boom name of the eighties, rocketing from obscurity (Americans first heard it via the wife of doomed poet Dylan Thomas) to the height of popularity in the space of a decade. The original name was gradually eclipsed by its myriad spelling variations -- Katelyn and Kaitlyn both soon topping it on the popularity lists.

Donald has been used for centuries in Scotland, where the Macdonald clan is one of the most ancient and where there have been six early Scottish kings by that name. Donald was a Top 20 name throughout most of the early twentieth century.

With its sharp, succinct sounds and cool, laidback style, Eli is a popular choice among parents today. Compact and punchy, it is a Biblical name with plenty of charm.

Jackson is one of those names that's much more popular than you think, coming in near the top of our annual Playground Analysis, which ranks names by grouping all their spellings together. Last year, nearly 17,000 baby boys were named Jackson -- along Jaxon, Jaxson, Jaxxon, Jaxen, Jaxyn, Jaxsen, and Jaxsyn -- which counted together makes it the Number 3 boys' name.

At the height of the Jennifer craze, many parents were cutting straight to the nickname and putting Jenny on the birth certificate. But now that Jennifer is the mom rather than the daughter, Jenny, which has been somewhat replaced by Jenna, has faded as well.

Jethro, though the biblical father-in-law of Moses, has suffered for a long time from a Beverly Hillbilly image, but some really adventurous parents might consider updating and urbanizing it and transitioning it into the hip o-ending category.

Every other little kid's name in 1957 but few Jameses are called Jimmy today; they're more often James or Jamie.

Currently overshadowed by the bright and lively Leo, Leon feels a slightly more serious, more quietly confident than its short and trending counterpart.

Leroy's heyday was in the early twentieth century, when it was in the US Top 100 until 1949. As a result, it's now more frequently seen as a father or grandfather name rather than a viable newborn option. Though it has dropped off the popularity charts several times in recent years, it hasn't fallen into complete obscurity yet.

Unlike Jake or Sam, few parents put Mike on the birth certificate.

A second-tier classic, the New Testament Timothy moves in and out of fashion more than John and James. But though it peaked in the 1960s, many modern parents still appreciate its familiarity and lively rhythm. And the short form Tim feels eternally boyish.

Tobias is one of a number of s-ending boys' names that are riding a wave of popularity. With its Old Testament-Dickensian feel, it's a name with a distinguished pedigree.

A zippy little international name. The Hebrew name relates to the month of Israeli independence. The Slavic Ziva (also spelled Živa and Siva) is a goddess of love, life and fertility.