Knowledgeable K's

The family of Kaylin names includes a wide variety of spellings—Kaylen, Kaelyn, and Kaylynn are a few—that enjoy varying degrees of popularity. This particular spelling plays on a couple contemporary trends, namely the ae vowel combination and the -lynn ending. While it's definitely a distinct spelling, it's likely to be misspelled more often than not.

Kalena is one of those names that has a pleasant-if-synthetic feel. Research turns up a range of origins and meanings, but the most reliable peg it as a derivation of Katherine.

Kara and the soundalike (though not necessarily related) Cara are among the most multi-cultural names around. Cara has roots in Latin, Italian, Irish, Spanish, and Portuguese, and Kara can be viewed as simply as K-starting version of Cara.

Keeley is well-used in modern Ireland, also found as Keely and Keela. The boys' form is Keelan. Largely unknown in the US, this could make an interesting update for Kelly or Kaylie or Kylie. A famous bearer is actress Keeley Hawes.

Keira is an attractive girls’ name that's gotten a huge boost from the meteoric rise of Keira Knightley. Original spelling Kiera, which relates more directly to the male Kieran, was the more popular form until the rise of Keira Knightley reversed the order. Both are Anglicized versions of the Irish Ciara.

Kendra was once seen as a feminization of Kenneth -- but it's now firmly established as a standalone. American parents can't seem to make up their mind about it though: it was one of 2013's fastest-rising names, entering the Top 200 for the first time since 2000, but then it tumbled again.

Chosen for their first son by musical couple Gwen Stefani and Gavin Rossdale, this Jamaican place and elegant British surname also boasts the more regal yet user-friendly short form, King.

A Scottish surname name, more popular as the Presidential McKinley, meaning "son of the fair hero".

Light and glittery, but with plenty of spirit, Kinsley has risen quickly into the US Top 100. Balanced between preppy and cutesy, it feels like a fresh alternative to Kelly, Kaitlyn, or Kimberly.

Lovely, authentic name -- but any Kirsten will be condemned to a lifetime of hearing "Did you say Kristen?" They're both genuine Scandinavian names but too interchangeable.

Knox is an old Scottish surname that Brad Pitt (whose great-great-grandfather was named Hal Knox Hillhouse) and Angelina Jolie took out of the back cupboard, dusted off, and elevated to coolness--to the point where it entered the popular baby names list in 2009. Knox now ranks among the most influential celebrity baby names.

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.

Kyle is still appreciated by thousands of parents each year for its combination of simplicity, strength, and style; it was in the Top 20 for most of the nineties. As a Scottish surname, it dates back to the fifteenth century.

The girls' name Kyra sounds like the also popular Keira/Kiera, but has a different root. There are twice as many baby girls named Keira as Kyra, with Kiera in third place. Kyra now ranks at #590 and is most familiar via actress Kyra Sedgwick.