Juan, the Spanish version of John, is ubiquitous in the Spanish-speaking world, and is familiar internationally via such references as Don Juan and San Juan.

Joel is one of those boys’ names that's never been super-popular yet has never been UNpopular either -- it's been in the Top 400 in the US since we started keeping statistics in 1880. So it's inevitable that its female form Joelle would gain visibility too, and indeed Joelle was used most widely during Joel's reign in the Top 100, from the late 1960s through the early 1990s.

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.

While Jadon is the authentic biblical name, Jaden is by far the more popular spelling, first noticed when Will and Jada Pinkett Smith used it for their now grown (and famous) son. It has since swept the country for both sexes, with a wide variety of spellings and rhyming cousins.

A sweet name with many cross-cultural ties: it's an equivalent of Jane in languages including Czech, Slovak, Dutch, German, Slovene, Catalan, Estonian, and Latvian.

A Top 100 name from the 1930s all the way through the 1950s, it's now firmly in Mom -- or Grandma -- land and supplanted for babies by Joanna.....or even great-grandmother Josephine. In its heyday, it had a host of variations, including JoAnn and Jo-Anne.

One of several phonetic spellings of Jackson moving up the charts, Jaxson entered the Top 100 in 2013 and has remained there since. It's also picking up steam in England and Wales.. Actor Eric Mabius used it as his son Rylan's middle name.

Jagger is a swaggering Rolling Stone of a name that's been picked up by a number of fellow celebs, including Lindsay Davenport and Brett Scallions--while Soleil Moon Frye pulled a gender switch when she bestowed it on her daughter. It's edgy with a touch of danger.

Judd is a strong but sensitive short form that can easily stand on its own, the second 'd' giving it a lot more substance, and it would also be a good middle name choice. Two recent actors have given it credence--Judd Nelson and Judd Hirsch, and now it's most noticeably represented by comedy director Judd Apatow.

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.

A variation of Jameson. Both names have climbed in popularity in recent years, though Jameson remains the preferred spelling.

Peaked in the 1940s, but still an amiable classic, a la Joe and Tom -- though rarely used on its own.

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.

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.

The ultimate dad name.

The name Jo still evokes the spunky image of the character in Louisa May Alcott's Little Women. Its literary status makes Jo one of the OG boyish nicknames for girls, ala Frankie, Billie, and Stevie. If you like that form, you can lengthen it to Joey.

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.

The Jodie spelling might be even more obscure, at this point, than the fading original, except actresses Jodie Foster and Jodie Sweetin have kept it in the public eye.

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.

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".