| Guadiana | Guadiana |
| Guarana | guarana |
| Guardian | guardian |
| Guanabana | soursop |
| Guanábana | soursop |
| Guanin | guanine |
| Guaraní | Guaraní guarani |
| Quadrant | quadrant |
| Gradient | gradient |
| Radiant | radian radiant |
| Diana | Diana Diane Dayanna Deana Deanna Deanne |
| Indiana | Indiana |
| Gondwana | Gondwana |
| Adana | Adana |
| Guyana | Guyana |
| Guadalcanal | Guadalcanal |
| guamisch | Guamanian |
| Guanako | guanaco |
| Guanidin | guanadine |
| Guano | guano |