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.

Originally used for children baptized in holy water from the river Jordan, it became one of the leading androgynous names of the nineties. As the balance tips toward the boys' side, it's slipping on the girls' popularity chart. Alternate spelling Jordyn is now more popular for girls.

Jolie is as pretty as its literal meaning; nowadays it is also seen as a girls’ name, via Angelina for whom Jolie was originally her middle name.

Joe is still the ultimate good-guy name, not at all diminished by its longevity or popularity or its everyman rep as Regular Joe, Cowboy Joe, G.I. Joe, Joe Exotic, Joe Blow, Joe Millionaire, Average Joe — and now President Joe (Biden).

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.

Jerome has a bespectacled, serious, studious image, just like its namesake saint, who was a brilliant scholar. St. Jerome is the patron saint of students, librarians, and archaeologists.

The biblical Judith, the fourth most popular name in 1940, may be getting ready for a comeback in its full, elegant, if somewhat solemn form. Many of those earlier Judiths were called Judy—some after Judy (born Frances) Garland—preferring it over their more formal proper name. Today, Judith, like Deborah, may have shaken off just enough to appeal to parents looking for a traditional, yet under-the-radar biblical name. And Jude would be a likelier nickname these days than the Judge Judy connection.

Jaxon has been mostly climbing in popularity since it entered the Top 1000 in 1997, proving that many parents have decided to rev up the cool factor of Jackson by giving it this streamlined spelling. (Though we still prefer the original.)

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

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.

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.

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.

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 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.

Jessie has never been used as much as Jennie/Jenny, partly because it's a boys’ name as well (spelled Jesse), but it does have a friendly and unpretentious pioneer feel. In Scotland, it's found as an Anglicized form of Teasagh, itself a form of Jean, and is used as a full name. And in the rest of the world, Jessie may be short for Jessica or used on its own.

The ultimate midcentury nickname, retaining a good measure of retro charm, was chosen for her son by Mira Sorvino.

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

This spelling of Jillian is now much more popular than the original, maybe because the G version invites pronunciation problems.

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.

Justice, one of the rare virtue names for boys, entered the popularity ranks in 1992, and remained in the charts until the 2020s. While it has fallen out of favor in more recent years, it remains a fresh but solid feeling option.