Many names for boys (and girls too) can start with either a C or a K. The C and K spellings have become basically interchangeable. Typically, the K spelling is the variation, although that is not always the case. Names such as Cai and Cale have spawned from Kai and Kale. In some cases, both spellings are equally legitimate, such as with Cillian and Killian, or Caspar and Kaspar.
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Along with Kai and Killian, other boy names that can start with a C or a K in the US Top 1000 include Cairo and Kairo, Cash and Kash, Colton and Kolton, and Crew and Krew. Those in which both spellings are rare include Caius and Kaius, Cato and Kato.
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The choice of C or K as an initial may reflect your feelings on name style, traditionality, and image. Here, a selection of boy names that work with either C or K as a first letter.

Boy Names That Can Start with a C or a K

Cade

Caden

Cadence

Caelan

Cain

Cairo

Caius

Cale

Caleb

Calixto

Callen

Callum

Calvin

Camari

Camden

Cameron

Canaan

Cannon

Carl

Carlsen

Carson

Carsten

Carter

Cartier

Case

Casey

Cash

Cashton

Cason

Caspar

Cato

Christian

Christopher

Cian

Cillian

Clay

Clayton

Clement

Coby

Cody

Cole

Colt

Colton

Cooper

Corbin

Cordell

Crew

Cruz

Kade

Kaden

Kadence

Kaelan

Kain

Kairo

Kaius

Kale

Kaleb

Kalixto

Kallen

Kallum

Kalvin

Kamari

Kamden

Kameron

Kanaan

Kannon

Karl

Karlsen

Karson

Karsten

Karter

Kartier

Kase

Kasey

Kash

Kashton

Kason

Kaspar

Kato

Kian

Killian

Klay

Klayton

Klement

Koby

Kody

Kole

Kolt

Kolton

Kooper

Korbin

Kordell

Krew

Kristian

Kristofer

Kruz

Boy names that can start with the letter C or K, such as Cash and Kash, Cillian and Killian, and Caleb and Kaleb (All Names)

Boy Names That Can Start with a C or a K - All Names