| Godofredo | | go-dho-FRE-do (Spanish) | Spanish, Portuguese | |
| GonÇAlo | | goon-SA-loo | Portuguese | |
| GraÇA | | GRA-sə | Portuguese | |
| GracÍLia | | grə-SEEL-yə | Portuguese | |
| Graciana | | grah-THYAH-nah (Spanish), grah-SYAH-nah (Latin American Spanish), grə-SYA-nə (Portuguese) | Spanish, Portuguese | |
| Graciano | | grah-THYAH-no (Spanish), grah-SYAH-no (Latin American Spanish), grə-SYA-noo (Portuguese) | Spanish, Portuguese | |
| GuÁLter | | - | Portuguese | |
| Gualberto | | - | Portuguese | |
| Guilherme | | gee-LYER-mə | Portuguese | |
| Guiomar | | gee-oo-MAR (Portuguese), gee-o-MAHR (Spanish) | Portuguese, Spanish, Arthurian Romance | |
| Gustavo | | goo-STAH-vo (Italian, Spanish) | Italian, Spanish, Portuguese | |
| HÉLder | | - | Portuguese | |
| Haroldo | | ah-ROL-do (Spanish), ə-RAWL-doo (Portuguese) | Spanish, Portuguese | |
| Heitor | | - | Portuguese | |
| Helder | | - | Portuguese | |