Although the Kathryn spelling feels like a modern streamlining of this ancient royal and saints' name, it is in fact found back through history. At least one of Henry the Eighth's unfortunately wives sometimes spelled her name as Kathryn.

A huge name in the late 90's and most of the 00's, Kaitlyn's been on a downward trend in recent years. Kaitlyn and its soundalikes have been so well used in the US that they can no longer be seen as fresh, but it's still relatively popular in Canada.

This appealing multi-cultural name, pronounced KYE, is beginning to be used for girls as well as boys. Among its many derivations and meanings: "sea" in Hawaiian, "forgiveness" in Japanese, "willow tree" in Navajo, "food" in Maori, and "earth" in Scandinavian. For girls, it debuted on the US Top 1000 in 2010.

Biblical name Cain was, until recently, seldom heard outside of the Old Testament and soap operas. Although Cain's murderous actions will always make this name difficult for some, Cain, Eve and Adam's firstborn, was a farmer - making this a good choice for those with farming connections. Long outshone by Abel, Cain is starting to find a broader audience, helped along by homophones Kane or Caine.

The Russian version of Katherine is usually Ekaterina, but this form is used throughout Eastern Europe and may be more friendly to the American ear.

One of the most popular of the trendy Caitlin variations, Katelyn points directly to components Kate and Lyn --making it a bit more traditionally feminine.

Kade falls into the trend of using a letter K at the beginning of a traditionally C-starting name, perhaps to give it a sharper edge. Trending since the 90s, Kade is currently in the Top 400, while Cade ranks nearly around 70 places ahead. Given to 933 babies in 2023, it is a consistently used name.

Kay as a masculine name has diverse origins. It can be a short form of names like Kenneth or Kai, or derive from the Middle English word 'key.' In Arthurian legend, Sir Kay was King Arthur's foster brother and seneschal, lending the name a noble, medieval connection. It's also associated with the Old Norse name Kái, meaning 'rejoice.' This brief, one-syllable name has maintained steady but modest usage throughout the decades. Its simplicity and strong sound make it appealing for those seeking a straightforward yet distinctive name for a boy. Kay also has cross-cultural appeal, appearing in various forms in Germanic, Celtic, and Scandinavian traditions.

Cayden is one of the many spellings of this popular name, made all the more popular when they're counted together. According to our annual playground analysis, sound-wise at least, Cayden is the 13th most popular name in the US, given to more than 10,600 baby boys.

The hurricane blew this one out of the realm of possibility.

An Irish and Welsh form of Catherine, Caitlin was a boom name of the eighties, rocketing from obscurity (Americans first heard it via the wife of doomed poet Dylan Thomas) to the height of popularity in the space of a decade. The original name was gradually eclipsed by its myriad spelling variations -- Katelyn and Kaitlyn both soon topping it on the popularity lists.

Kay, a cigarette-smoking, nightclubbing name of the 1930's, could be ready for a comeback along with cousins May/Mae and Ray/Rae.

This version of Kaden is also a popular choice and one of the many boys' names starting with k that can also start with a C, as in Caiden, Cayden et al.. Kaiden Alenko is a character in the video game Mass Effect.

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.

This name's similarity to Kalani and pretty Hawaiian origin helped catapult it into the Top 1000 for the first time in 2013.

One of the warm and earthy Russian nickname names now coming into style. Denzel Washington gave his daughter the Katia spelling.

A variation of the popular Caden, Kayden, Kaden, and so on, Caiden is in the US Top 500 and the UK Top 1000. When you combine all the spelling variations however, Caiden begins to feel and sound like a Top 20 choice in the States.

An attractive and intriguing choice with an appealing blend of gentle and sharper sounds, Kasia is a diminutive of Katarzyna, the Polish form of Katherine. Ultimately from Greek, it is generally interpreted to mean "pure".

A short form that is given on its own to a good number of baby girls each year — Cali has been on trend in recent years along with sister names Callie and Kali, as the popular 90s and early 2000s nickname Allie has felt less fresh.

Time was, even C-starting Catherines who called themselves Kate spelled it with a K, but Cate Blanchett changed all. Cate is now as acceptable as (but not as well used as) Kate. Cait might be short for Caitlin.