| Abbreviation | Definition |
|---|---|
| GOAT | Greatest Of All Tims |
| GP | Gary Payton |
| GP | Great Prognosticator |
| GPA | Grandpa |
| Greta | Margaret |
| GRNAM | Group by Name |
| GS | Gelande Strasse |
| GS | Gloria Steinem |
| GS | Gwen Stacy |
| GT | George Thomas |
| GTR | Gary Thomas Randall |
| GUM | Great Uncle Matthew |
| GUS | Augustus |
| GUS | Gustav |
| GUZ | Guzman |
| GW | George Washington |
| H | Hamilton |
| H | Hannah |
| H | Harold |
| H | Harriet |