Kai is an internationally flexible name with many possible origins and meanings, growing in popularity in the US and a diverse range of European countries.
 
In the US, the name Kai is most commonly referred to as being of Hawaiian derivation, meaning "sea." In Europe, Kai is largely considered to have Frisian origin as a diminutive of the name Kaimbe, meaning "warrior", or as a short form of Gerard "brave spear". 
 
Kai is also found as an independent name in African, Chinese, Turkish and Native American cultures. Kai is a strong, evocative multi-cultural name that packs a lot of power in its single syllable. 
 
Famous as the name of the boy enchanted by the fairy-tale Snow Queen, Kai was chosen for her son by actress Jennifer Connelly and as a middle name for son Samuel by Naomi Watts and Liev Schreiber. 
 
Kai is popular with Berries as both a first and middle name choice. Perhaps because of its international familiarity, Kai is popular in video games. Its most prominent namesake is Danish-born jazz trombonist Kai Winding.
 
Kai ranks in the US Top 1000 for girls, but is used more than 90 percent of the time for boys. Donald Trump, Jr. has a daughter named Kai Madison and Gigi Hadid and Zayn Malik named their daughter Khai in 2020.

Kairi is the name of the main female character in the popular role-playing video game series, Kingdom Hearts. Voiced by Hayden Panettiere in the main series, Kairi is one of the seven Princesses of the Heart. Kairi entered the US Top 1000 in 2010 and was given to over 400 baby girls in one recent year.

Kairi

Kala

Kari and all her many sisters, from Carrie to Carey to Kerry and onward, originated for the most part as short forms of either CatherineKatherine or one of the Charles feminizations such as Carol or Caroline.

The Kari spelling may feel particularly contemporary and flexible in terms of its derivation.

Kari

Kasimir

Kate, in the headlines via Catherine Middleton aka the Princess of Wales, has been as pervasive as Kathy was in the 1950s and 1960s, both as a nickname for Katherine and Kaitlyn and as a strong, classic stand-alone name. 
 
Kate has an image that's independent, smart, and energetic, recalling Kate Hepburn, the heroine of The Taming of the Shrew/Kiss Me Kate, and contemporary Kates Winslet, Hudson, Moss, Spade and Beckinsale. Cate Blanchett has helped popularize that spelling of the name.
 Kate is also the female equivalent of Jack as a favorite character name in the movies, TV, and books. It's down-to-earth yet classy, common yet cool.
 Kate has always been, and remains, mega popular in Ireland.

Kate

St. Kateri Teckakwitha is the first Native American saint, canonized in 2012.  St. Kateri was the daughter of a Mohawk warrior, born in 1656 in upstate New York.  She converted to Christianity at age 20 and died at 24, and was known as "Lily of the Mohawk."  Kateri was the name the saint took on, a native variation of Katherine, upon her baptism.

Kateri

Friendly mega-popular short form of Katherine that has definitively replaced Kathy, Katie is often given on its own.  Going forward, though, Katie is more stylishly clipped itself to the grownup Kate.

Katie

Kerensa, forever romantic, is a rare Cornish name spelled with an 's' or 'z', the most modern of the Karen family. Kerensa (or Kerenza) has ties to the Welsh Cerys.
 Kerensa is a name favored by novelists who are using a Cornish setting, such as Victoria Holt in The Legend of the Seventh Virgin.
 The Kerenza spelling has a bit more zip.

Kerensa

This lively Old Testament nature name (belonging to one of the three beautiful daughters of Job) may be missing from the current US Top 1000 list, but it ranks highly here on Nameberry — making it one to watch!

 Also spelled Kezia, the name has multiple legitimate pronunciations — from "KEE-szhah" to "KEZ-ee-ah" to "keh-ZYE-ah" — and comes complete with the sweet and sparky nickname Kizzy. A related name is the lovely cinnamon-scented Cassia, which beginning to be discovered by lovers of the fashionable Cas- clan.

Keziah

Kiara can be considered a variation of both the Italian name Chiara and the Irish name Ciara. Chiara is the Italian form of Clara, meaning "bright" or "clear," while Ciara is the feminine form of male given name Ciar, derived from the old Irish cíar, meaning "dark." 
 
Kiara is also an Australian name derived from an Aboriginal word for the white cockatoo, and has roots as a Korean name meaning "first ray of sun".
 
Simba's daughter in The Lion King, Kiara fits in with stylish modern names like Keira and Kaia.

Kiara

Kick is a word name that some parents might use for their baby in utero — akin to Bean or Booboo — but it's increasingly being heard as a word name especially used in the middle, ala Jeremy Sisto for son Bastien.  The Kennedy family has historically called daughters Kathleen Kick for short, and Kick can work as a nickname for a whole range of names male and female, from Nicholas to Keturah.

Kick

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. 
 Kiki is also a Japanese name most famous via an anime film, Kiki's Delivery Service.
 The notorious artist-actress known as Kiki de Montparnasse but born Alice Ernestine Prin, was most famous as a muse for such Parisien artists as Soutine, Picabia and Cocteau. English singer Kiki Dee was originally named Pauline Matthews.

Kiki

Unisex name around for several decades for boys and now ripe for girls. 

Kirby

The name Kiri was made famous by New Zealand soprano Kiri Te Kanawa, whose original name was Claire.  Cute but slight, Kiri is close to several other names from Kiriah to Keira to Kyra and its diminutive Kyrie.

Kiri

The next Destiny? Kismet seems like it might be fated for increased use. 

Kismet

Kizzy was a character in Alex Haley's Roots; this and other Keziah variations were widely used among enslaved people. In Roots the name is explained by the hero Kunta as 'you sit down' or 'you stay put' in the Mandinka language meaning that 'this child would never get sold away'.

Kizzy

A word in the Yankton-Yanktonai and Santee dialects of the Lakota Sioux language, meaning "friend" or "ally", used for one of the main characters in the movie Brother Bear. Also a common Japanese surname or a respelling of the musical name Coda.

Koda

Krizia is a stylish Italian clothing and handbag designer and manufacturer. The name is an interesting alternative to all those old Cris/Kris-starting names. Krizia is one of those <a href="https://nameberry.com/baby-names/505/italian-names-for-girls">Italian names for girls</a> that's both intriguing and rare.

The Master List - K