| EQUIVALENTS |
| ANCIENT GERMANIC: Carolus, Karl |
| CATALAN: Carles, Carlos |
| CROATIAN: Karlo |
| CZECH: Karel |
| DANISH: Carl, Karl |
| DUTCH: Karel |
| ENGLISH: Carl, Carol, Charles, Karl |
| FINNISH: Kaarle, Kaarlo, Karl |
| FRENCH: Charles |
| GERMAN: Carl, Karl |
| HAWAIIAN: Kale |
| HUNGARIAN: Károly |
| IRISH: Séarlas |
| ITALIAN: Carlo |
| LIMBURGISH: Sjarel |
| LITHUANIAN: Karolis |
| NORWEGIAN: Carl, Karl |
| POLISH: Karol |
| PORTUGUESE: Carlos |
| ROMANIAN: Carol |
| SLOVAK: Karol |
| SLOVENE: Karel, Karol |
| SPANISH: Carlos |
| SWEDISH: Carl, Karl |
| WELSH: Siarl |
|
| DIMINUTIVES AND SHORT FORMS |
| ENGLISH: Charley, Charlie, Chas, Chaz, Chip, Chuck |
| FINNISH: Kalle |
| FRENCH: Charlot |
| HUNGARIAN: Karcsi |
| PORTUGUESE: Carlinhos, Carlito, Carlitos |
| SPANISH: Carlito, Carlitos |
| SWEDISH: Kalle |
|
| FEMININE FORMS |
| AFRIKAANS: Charlize |
| ANCIENT GERMANIC: Carolina |
| CATALAN: Carla |
| CROATIAN: Karla, Karolina, Lina |
| CZECH: Kája, Karolína |
| DANISH: Caroline, Charlotte, Ina, Karla, Karolina, Karoline, Lina, Line, Lotte |
| DUTCH: Carla, Carola, Carolien, Caroline, Charlotte, Lien, Lotte |
| ENGLISH: Calleigh, Callie, Cari, Carla, Carlene, Carley, Carlie, Carly, Carlyn, Carol, Carolina, Caroline, Carolyn, Carrie, Carry, Caryl, Charla, Charleen, Charlene, Charlotte, Ina, Kallie, Karlee, Karlene, Karly, Karolyn, Karrie, Lina, Lottie, Sharla, Sharleen, Sharlene, Tottie, Totty |
| FINNISH: Iina, Karoliina, Liina, Lotta |
| FRENCH: Carole, Caroline, Charline, Charlotte, Line |
| GERMAN: Carla, Carola, Carolin, Caroline, Charlotte, Ina, Karla, Karola, Karolina, Karoline, Lotte |
| HUNGARIAN: Karola, Karolina, Lili |
| IRISH: Séarlait |
| ITALIAN: Carla, Carlotta, Carola, Carolina, Lina |
| LITHUANIAN: Karolina, Lina |
| MACEDONIAN: Karolina |
| NORWEGIAN: Caroline, Charlotte, Ina, Karla, Karolina, Karoline, Lina, Line, Lotte |
| POLISH: Karolina |
| PORTUGUESE: Carla, Carlota, Carolina |
| SLOVENE: Karolina |
| SPANISH: Carla, Carlota, Carolina |
| SWEDISH: Carola, Carolina, Caroline, Charlotta, Charlotte, Ina, Karla, Karolina, Lina, Lotta, Lotte, Lottie |
|
| OTHER FORMS |
| HISTORY: Charlemagne |
|