Jen is a short, crisp feminine name that originated primarily as a diminutive of Jennifer, though it can also be a nickname for names like Jenna, Jenny, or Genevieve. The root name Jennifer comes from the Welsh 'Gwenhwyfar,' meaning 'white wave' or 'fair spirit.' Jen gained independent usage during the 1970s and 1980s when Jennifer was at peak popularity, with some parents choosing to put just 'Jen' on the birth certificate. Its simplicity and directness appeal to those preferring unpretentious, straightforward names. While Jen's popularity as a stand-alone name has declined since the 1990s, it maintains appeal for its brevity and friendly, approachable quality. The name carries a casual confidence and remains recognizable without being overly common as a formal name.

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

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.

A Jada alternative that has lost ground this decade after peaking around 2010.

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.

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

Jonny is a masculine name primarily functioning as a diminutive or informal version of Jonathan, which derives from the Hebrew name "Yehonatan" meaning "gift of Jehovah" or "God has given." Jonny offers a friendlier, more approachable alternative to the more formal Jonathan. While sometimes used as a standalone name on birth certificates, it's more commonly a nickname. The spelling with two 'n's distinguishes it slightly from the variation Johnny. This name carries a youthful, casual energy and has been moderately popular in English-speaking countries. Jonny has associations with relaxed, down-to-earth personalities and has been used for various characters in popular culture and sports figures.

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.

Jeanelle combines the classic French name Jean (feminine form of John, meaning 'God is gracious') with the popular feminine suffix 'elle,' creating a melodic and elegant compound name. This blending gives Jeanelle a distinctly French-inspired sophistication while maintaining approachability. Though relatively uncommon, Jeanelle emerged in the mid-20th century alongside similar combination names. It offers a more elaborate alternative to Jean while sharing qualities with names like Janelle and Jeanette. The name carries connotations of femininity and grace, with its soft sounds and flowing syllables creating a name that is both distinctive and pleasantly familiar.

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

The ultimate dad name.

A feminization used more before Jordan joined the girls' camp.

Together with the more common (in France) Jeannine spelling, this feminine form of Jean was most popular in the 1930s in its home country, and in the 1960s in the US. It's fallen off the Top 1000 list since, but perhaps cute retro nickname Jeannie could tempt some vintage-loving parents back.

Joakim is a masculine name with Hebrew origins, representing a Scandinavian and Eastern European form of Joachim. Derived from the Hebrew name Yehoyakim, meaning 'established by God' or 'God will raise,' Joakim carries strong religious and historical significance. Particularly popular in Sweden, Norway, Finland, and parts of Eastern Europe, the name has maintained steady usage throughout centuries. Joakim became internationally recognized partly through notable bearers including basketball player Joakim Noah and various European athletes and artists. The name blends biblical heritage with a contemporary Scandinavian feel, offering a distinctive yet accessible choice. While not among the most common names in English-speaking countries, Joakim provides an international alternative with both cultural depth and modern appeal.

This spelling of the traditional nickname for John is a bit more feminine than Johnny, based on the fashion at the turn of the 20th century to use boyish diminutives ending in -ie for girls.

From obscure male biblical boy's name to unisex favorite, Jadon/Jaden, in all its variations, has had a meteoric rise in popularity, building on Jade and Jada, plus the trendy en ending.

Could run into pronunciation confusion.

Jarred is a masculine name that emerged as a variant spelling of Jared, which has Hebrew origins meaning 'descent' or 'he who descended.' This alternative spelling became particularly popular in the United States during the 1970s and 1980s. The name has biblical roots, as Jared appears in the Book of Genesis as a patriarch before the flood. Jarred offers a slightly more contemporary feel than the traditional spelling, with the double 'r' adding a distinctive visual element. The name conveys strength and masculinity while remaining approachable. Though its popularity has declined since its peak, Jarred continues to be chosen by parents who appreciate its biblical connections combined with its modern spelling variation.

A possible, and not too successful, attempt to individualize Jocelyn or formalize Jacey.