ances tree

Isabel derived from Elizabeth in southwest Europe during the Middle Ages. It was originally written as Elisabel, but the first syllable was dropped as it spread across the continent. In Spain and Portugal, Isabel and Elizabeth are considered to be variations of the same name, but they are treated as separate names in other European countries and the US.

Isabella has been a Top 10 name for girls in the US for two decades now. The Latinate form of Isabel, a variation of Elizabeth which originally derived from the Hebrew name Elisheba, Isabella reigned as Number 1 in 2009 and 2010.

Isaiah, like brethren Isaac and Elijah, is a once neglected biblical name now firmly back in favor, already surpassing such long-popular Old Testament stalwarts as Aaron and Adam. Isaiah has ranked on the US Top 1000 list for boys every year but two, 1969 and 1970.

Though it was used by the Puritans in the sixteenth century, the founding of the modern Jewish state in 1948 transformed Israel from a traditional favorite into an icon of Judaism.

Though some might find it a bit heavy-booted, Ivan is one of the few Russian boys' names to become fully accepted into the American naming pool.

Jabez has a rare combo of three appealing elements: a Biblical heritage, a captivating Southern accent, and a jazzy feel. It was popular with the Pilgrims and on into the nineteenth century (there have been four U.S. Congressmen named Jabez), but it hasn't been in the Top 1000 since 1880.

The name of two Old Testament kings that seems as ripe as you can get for modern use, given the popularity of sound-alike Biblical brethren Jadon and Jacob (and even mythological Jason). Note that different sources give wide-ranging meanings for Jabin, but we think "perceptive" is the most authoritative, not to mention appealing.

Jackie Kennedy gave this name a lot of style, but it doesn't seem destined for a comeback the way brother name Jack has. Jackie and Jacqueline both peaked in 1961.

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. There were nearly 17,000 baby boys named Jackson -- along Jaxon, Jaxson, Jaxxon, Jaxen, Jaxyn, Jaxsen, and Jaxsyn -- which counted together makes it the Number 3 boys' name.

Biblical Jacob ceded his Number 1 spot to biblical Noah, in 2013, after holding first place on the list of baby boy names from 1999 to 2012, given a huge boost by the Twilight phenomenon.

Jacqueline originated as a feminine form of Jacques, the French variation of James, and therefore Jacob. Jacob was ultimately derived from the Hebrew name Ya’aqov, and gets its meaning, "supplanter" from the story of Jacob supplanting his brother Esau as the first-born son in the Bible. Jacqueline was first used in France in the Middle Ages.

James is one of the classic Anglo-Saxon names, a stalwart through the ages that is more popular—and yes, stylish—than ever today. It recently came out Number 1 in a poll of America's favorite boys' baby names, and is the most common male name, counting people of all ages, in the US.

Jamie is typical of the relaxed unisex names starting with J that seemed so cool in the sixties after decades of Jeans and Joans, though now pretty tepid. Jaime and even Jamey and Jayme are alternate spellings.

A standard form of John in Dutch, Swedish, Norwegian, Danish, Czech, Polish, Slovene, German, and Catalan. Properly pronounced yahn (in most of these languages), most Americans will still equate it with the Brady Bunchesque girls' name Jan.

No, we don't consider Jane too plain. In fact, for a venerable and short one-syllable name, we think it packs a surprising amount of punch, as compared to the related Jean and Joan.

Janet started as a pet form of Jane but has long been used independently. Jane is a feminine form of John, which derived from the Hebrew name Yochanan. Janet can also be considered a variation of Jeannette, a derivative of Joan and another feminization of the name John.