27 last names begin with Ga
- Gabel (1)
- Gaither (1)
- Gale (3)
- Galfond (1)
- Galica (1)
- Gallagher (1)
- Galloway (1)
- Galyk (1)
- Gamble (36)
- Gantt (2)
- Gardiner (2)
- Gardner (2)
- Gardner Meredith Bullington Sanders (1)
- Gargurevich (1)
- Garlits (1)
- Garrard (1)
- Garrett (3)
- Gaskins (9)
- Gastiner (1)
- Gastinger (1)
- Gaston (1)
- Gatewood (1)
- Gault (15)
- Gaun (1)
- Gaunt (1)
- Gaunt Plantagenet, Duke of Lancaster (of) (1)
- Gay (61)
