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We're hearing Kat more and more being used by Katherines who are tired of Kathy, Kate and Katie. Katti or Kattie is another possibility.

Katherine is one of the oldest, most diverse, and all-around best names: it's powerful, feminine, royal, saintly, classic, popular, and adaptable. Long one of the top girls' names starting with K, Katherine has now been unseated on the popularity list by upstarts Kennedy and Kinsley, but a dip in popularity only adds to its charm.

A predominantly male name in the US until the late 1950s, the name continued to rise for both sexes for both sexes for a further decade, before starting to decline for boys. Despite dropping out of the boys' Top 1000 in 2002, Kelly retains a rugged Irish charm.

Variant of Kendall

Kerry is the name of one of the most beautiful and lush counties of Ireland was a seventies favorite. Related, updated versions might include Cerys and Keira.

Adding an extra 'R' to Kiera makes it rhyme with the fashionable Sierra. Kierra is a more distinctive choice than Kiera, Keira, or Kyra, all similarly pronounced, but there may be some pronunciation confusion.

Kiki is one of the Coco-Gigi-Fifi-Lulu bohemian-type French nickname names from the turn of the last century, which have endless energy and sparkle. Artist Kiki Smith is its most well-known contemporary representative, and Kiki was the inspiring heroine of Zadie Smith's On Beauty. Kiki can be a nickname for any name beginning with the K sound, from Katherine to Christina to Kayla.

This diminutive of Kimberley is gaining momentum as a standalone name. For our part, we're stumped by its rise.

Kristen may be somewhat past its fashion high point, but it remains forever crystalline clear. Possible problem: confusion with the similar Scandinavian names Kristin, Kirsten, Kirstie, et al.

Popular pop name, inspired by Australian singer Kylie Minogue. It was at its height in Australia in the 1970s and early 80s; often cited as a Noongar name meaning "boomerang".

A kind of old-fashioned nickname name that's enjoying some fresh life thanks to trendy brother Lane. Lainie is a more old-school spelling.

Laurie morphed into the more streamlined Lori in the sixties but now feels dated for a girl in either spelling. Update Lauren has been renovated as Laurel or Laura itself.

A lovely musical name (remember the old Eric Clapton-Derek & the Dominos song?), Layla's seen a significant surge in popularity, partly partly all names with a double L are stylish, and partly because all the forms of the name push it into the Top 15 for girls.

Lexi and Lexie, pixieish offshoots of the prolific Alex family, have come into their own. While it's on a gentle downslope, Lexi still ranks in the US Top 500.

In the US, London is popular for both sexes, though as the name rises for girls, it's levelled off for boys. Of course, London is far less popular in the UK and other English-speaking countries.

Though Loretta has long ago lost its Latin flair, fashionable Sarah Jessica Parker's choice of it as the middle name of one of her twin daughters freshens it up a bit. It's one of several such names, like Anita and Rita that we can envision making a comeback.

A versatile classic, Lucy is both sweet and solid, a saint's name, and the heroine of several great novels. First fashionable in England and Wales, Lucy is now a popular choice in the US, The Netherlands, and New Zealand.

Since we wrote a book called Beyond Jennifer & Jason, Madison & Montana, encouraging parents to move beyond overused names, it's no secret what we think of this trendy surname name, inspired by a mermaid named Madison in the 1980s movie Splash.