This once obscure name was propelled to fame by Britney Spears, and by Will and Jada Pinkett Smith in the 2000's. It skyrocketed into the US Top 10 for boys, but it also saw significant use for girls.

The name of the third U.S. President sounds, like Harrison and Jackson, more modern and stylish now than its root name. Used as a first name long before our surname-crazed era, Jefferson was most famously used as a first name by the President of the Confederacy, Jefferson Davis, which may justifiably make you not want to use it. Jefferson is the middle name of another Prez, William Clinton.

Some people may prefer this spelling to clarify the name's connection to John, but it could be one h too many, exemplified by its steady decline over the past two decades.

With Old European vibes, Johan is a variant of the classic John, similar to the Latin, Hebrew, and Germanic forms, Iohannes, Yohanan, and Johannes. Conjuring up the image of the classical composer Brahms or the astronomer Kepler, while still feeling timeless and distinctive, Johan has been in the US Top 600 for most of the 21st century, helped along by Heidi Klum and Seal using it for their son in 2006.

This variation of Jordan entered the Top 1000 in 1989. Jordyn as well as Jordan trended throughout the 90s and early 2000s, but are beginning to fall slightly on the girls' side. While the Jordan spelling reached the highest point in popularity out of the 2, making it into the Top 50 in the late 90s and early 2000s, today Jordyn has taken the lead.

A modern invention that's been in use since the 80s and in the charts since the 90s, which combines the sounds of Jasmine (or Jasper or just the word jazz) with the popular suffix, -lyn. Inspiration might also have come from Joslyn, Jocelyn, or Roslyn. Trendy but snazzy too, Jazlyn remains in the US Top 600.

Jacoby, a surname spin on Jacob shot up the charts in the middle of the 2000's, thanks largely to the popularity of Jacoby Ellsbury, the first Native American of Navajo descent in the Major Leagues, but has been dropping steadily since it peaked at Number 423 in 2008. As of 2022, it dropped out of the US Top 1000 and is given to around 170 boys each year.

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.

Once rare, this streamlined form of Jessica has been boosted by two very different television figures: the Jemima Kirke character on HBO series Girls, and reality television daughter Jessa Duggar.

Long used in Spanish-speaking countries, this strong but feminine name was jump-started here by the rise of actress Jada Pinkett Smith. The Italian Giada is a popular variation. In the Bible, the name Jada was borne by a man and has a different root and meaning: It's Hebrew and means "he knows".

Streamlined version of the classic boys' names, sometimes a short form of Jonathan, which is in fact an entirely different name from John attached to a different Biblical personage. Jon feels more modern than the traditional John, but some may find it an overly slight variation on an already slim name. Jon Snow is a popular character on HBO's Game of Thrones.

After cracking the US Top 200 in the early 2000s, fueled by Jacob's rise, this name has been losing steam in recent years. But Jakob is the top form of the name in many other countries, cultures, and languages, ranking highly in Germany, Norway, Austria, Iceland, and Slovenia. Jakub is the Polish variation.

The line should end with Junior Soprano. While most would expect this to be a nickname rather than an actual given name, Junior has always ranked in the US Top 1000, hitting its peak in 1925 at Number 116.

For a minute or two this sounded more modern than Janet, now equally outmoded.

Jules is one of the adorable boyish nicknames newly fashionable for girls. It's rarer than Billie, with a cool and casual feel. It's use in the popular TV series Euphoria - where the character of Jules Vaughn was portrayed by Hunter Schafer - brought this name into the spotlight.

Thanks to two cultural influences, January has joined March, April, June and August as a plausible month name.

Though every Spanish student knows that the male classic is pronounced HY-me, for girls this is a straight homonym for Jamie, a favorite ambisexual 1970s nickname name. Another way to think of it is as a variation of the French "J'aime" (meaning I love).

Cowboyish short form that's both macho and cool. Got prime time exposure on The West Wing.

Both Jeb and Jed are very attractive Old Testament short forms with long and bright futures. Jeb's main current association is with the Bush brother and former governor of Florida, but the name was a mainstay on early TV westerns, and then went upscale as the nickname (his birth name being Josiah) of the President on "The West Wing."