| Marcelinho | | - | Portuguese | |
| Marcelino | | mahr-the-LEE-no (Spanish), mahr-se-LEE-no (Latin American Spanish) | Spanish, Portuguese | |
| Marcelo | | mahr-THE-lo (Spanish), mahr-SE-lo (Latin American Spanish) | Spanish, Portuguese | |
| Marcelyn | | - | English (Rare) | |
| Marci | | MAHR-see | English | |
| Marcia | | MAHR-shə (English), MAHR-see-ə (English), MAHR-thyah (Spanish), MAHR-syah (Latin American Spanish) | English, Spanish, Ancient Roman | |
| Marcial | | - | Spanish | |
| Marciana | | - | Ancient Roman, Portuguese (Brazilian) | |
| Marciane | | - | Portuguese (Brazilian) | |
| Marciano | | - | Portuguese, Spanish, Italian | |
| Marcie | | MAHR-see | English | |
| Marcin | | MAHR-cheen | Polish | |
| Marcio | | MAHR-thyo (Spanish), MAHR-syo (Latin American Spanish) | Spanish | |
| Marco | | MAHR-ko (Italian, Spanish, Dutch) | Italian, Spanish, Portuguese, German, Dutch | |
| Marcos | | MAHR-kos (Spanish), MAR-koos (Portuguese) | Spanish, Portuguese | |