| Cali f English |
| Calleigh f English |
| Callie f English |
| Cari f English |
| Carl m Danish, English, German, Norwegian, Swedish |
| Carla f Catalan, Dutch, English, German, Italian, Portuguese, Spanish |
| Carlene f English |
| Carles m Catalan |
| Carley f English |
| Carlie f English |
| Carlinhos m Portuguese |
| Carlito m Portuguese, Spanish |
| Carlitos m Portuguese, Spanish |
| Carlo m Italian |
| Carlos m Portuguese, Spanish |
| Carlota f Portuguese, Spanish |
| Carlotta f Italian |
| Carlu m Corsican |
| Carly f English |
| Carlyn f English |
| Carol f & m English |
| Carol m Romanian |
| Carola f Dutch, German, Italian, Swedish |
| Carole f French |
| Carolien f Dutch |
| Carolin f German |
| Carolina f English, Ancient Germanic, Italian, Portuguese, Spanish, Swedish |
| Caroline f Danish, Dutch, English, French, German, Norwegian, Swedish |
| Carolus m Ancient Germanic |
| Carolyn f English |
| Carrie f English |
| Carry f English |
| Caryl f English |
| Charla f English |
| Charlee f English |
| Charleen f English |
| Charlemagne m History |
| Charlene f English |
| Charles m English, French |
| Charley m & f English |
| Charlie m & f English |
| Charline f French |
| Charlize f Afrikaans |
| Charlot m French |
| Charlotta f Swedish |
| Charlotte f Danish, Dutch, English, French, German, Norwegian, Swedish |
| Chas m English |
| Chaz m English |
| Chip m English |
| Chuck m English |
| Iina f Finnish |
| Ina f Danish, English, German, Norwegian, Swedish |
| Kaarle m Finnish |
| Kaarlo m Finnish |
| Kája f Czech |
| Kale m Hawaiian |
| Kalie f English |
| Kalle m Finnish, Swedish |
| Kallie f English |
| Karcsi m Hungarian |
| Karel m Czech, Dutch, Slovene |
| Karl m Danish, English, Finnish, German, Ancient Germanic, Norwegian, Swedish |
| Karla f Croatian, Danish, German, Norwegian, Swedish |
| Karlee f English |
| Karlene f English |
| Karlo m Croatian |
| Karly f English |
| Karol m Polish, Slovak, Slovene |
| Karola f German, Hungarian |
| Karoliina f Finnish |
| Karolína f Czech |
| Karolina f Croatian, Danish, German, Hungarian, Lithuanian, Macedonian, Norwegian, Polish, Slovene, Swedish |
| Karoline f Danish, German, Norwegian |
| Karolis m Lithuanian |
| Karolos m Greek |
| Karolyn f English |
| Karrie f English |
| Lien f Dutch |
| Liina f Finnish |
| Lili f Hungarian |
| Lina f Danish, English, Italian, Lithuanian, Norwegian, Spanish, Swedish |
| Line f Danish, French, Norwegian |
| Lotta f Finnish, Swedish |
| Lotte f Danish, Dutch, German, Norwegian, Swedish |
| Lottie f English, Swedish |
| Séarlait f Irish |
| Séarlas m Irish |
| Sharla f English |
| Sharleen f English |
| Sharlene f English |
| Siarl m Welsh |
| Sjarel m Limburgish |
| Tottie f English |
| Totty f English |
