Names from Friends .list under construction.

Jack may have fallen from its Number 1 place in England, but in the US it's as popular as it was at its height in the 1920s and 1930s. A durable, cheery, everyman form of John, Jack ranks as one of the most popular boy names starting with J.

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

Jasmine was derived from the Persian word yasmin, referring to the jasmine flower. Scented oil was made from the plant, and it was used as a perfume throughout the Persian Empire. Variants include Jazmin, Yasmin, Yasmine, and Jessamine.

Jennifer is the Cornish variation of Guinevere, which ultimately derived from the Welsh name Gwenhwyfar. It has been in use in the English-speaking world since the 18th century but came to prominence in the 20th. Playwright George Bernard Shaw chose Jennifer for the name of his leading lady in his play The Doctor’s Dilemma, which drew more attention to the name.

Probably due to its nursery rhyme association, Jill has the perpetual air of a rosy-cheeked tot -- even though it is one of the oldest names on the roster, a medieval variation on the Roman Julia. The pairing of Jack and Jill to connote a generic boy and girl goes back at least to the fifteenth century. But can knowing Jill's history keep it from sounding like a cute mid-twentieth century invention? There may be some possibility of Jill making it back up the hill.

Joseph is one of the most classic names in American nomenclature, popular with parents from many ethnic backgrounds and having dual-religious appeal.

Judy was the nickname of choice for almost all the Judiths born in the 1940s and 50s; today's little Judiths are much more likely to be called Judith -- or, possibly, Jude.

Karen is a Danish diminutive of Katherine, an English name derived from the Greek Aikaterine. The etymology of Aikaterine is contested, but generally considered to have arisen from the Greek root katharos, meaning "pure." Kaja is a related name, as it is another Danish variation of Katherine.

Leonard is the name of several saints, including one who is the patron saint of childhood, and another medieval saint who's the patron of prisoners--known for freeing prisoners he deemed worthy of God. Popular from 1900 to 1930, Leonard is perhaps more notable for those who dropped the name when they entered show biz than those who kept it: former Leonards include Roy Rogers and Tony Randall. Two musical Leonards did keep their names though--composer-conductor Leonard Bernstein and poet-singer Leonard Cohen. Leonard Woolf was the husband and publisher of great English novellist Virginia Woolf. These days, modern parents tend to prefer Leo or the romantic Italian Leonardo, especially since Leonard does not get pronounced with the trendy "Leo" sound.

A Scottish place and surname that was once adrogynous but now leans about 20 to 1 toward the girls' side, Leslie has a pleasant, heathery feel that kept it in or near the Top 100 for several decades; the Lesly and Lesley spellings are also frequently used, especially in Britain. While Leslie may not be the freshest name in the bunch, it's become a modern classic and is one of the surprising names always to have ranked among the US Top 1000 for girls.

Lily is the most popular of the popular delicate century-old flower names now making a return, thanks to its many irresistible attributes: a cool elegance and a lovely sound, a symbol of purity and innocence, and a role in Christian imagery.

Elvis naming his daughter Lisa Marie and Nat King Cole's hit song "Mona Lisa" conspired to catapult one of Elizabeth's many offshoots to a high of #4 in 1970.

Matthew was the third most popular boys' name in America throughout the 1980s and '90s, and is still one of the top boy names starting with M. The New Testament Matthew is the epitome of the fashionable classic—safe and sturdy, yet with a more engaging personality than John or William.

This saintly name--she was the mother of St. Augustine--plummeted after the double whammy of Lewinsky and the demise of Friends.

Once a poetic Celtic name, that of the angel who governs the month of June, Muriel became the mom or grandma on TV sitcoms. She does have literary cred via Edinburgh-born author Muriel Spark, author of The Prime of Miss Jean Brodie and also appears as a character in Anne of Green Gables. Muriel was a Top 200 name from 1912 to 1933.

Nora is a lovely, refined name that conjures up images of Belle Epoch ladies in fur-trimmed coats skating in Central Park. Long seen as a quintessentially Irish name though its roots are not in Ireland, Nora is a quietly stylish favorite that's tiptoed to the top of the popularity ladder.

Paolo is an irresistibly lush Italian name for boys, worlds more romantic than its spare English equivalent.

To the thousands of girls who screamed the name of their favorite Beatle in the 1960s, the boys' name Paul had a thrillingly unique image, but to the rest of the world, then and now, it's a name that's so simple and yet so widely diffuse that it could belong to almost anyone. Paul is an ancient name for boys -- popular in Roman and medieval times -- that's not very fashionable now, which can work in its favor, scarcity balancing simplicity.