| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 501 | Glenn | Gaelic | From the glen. Valley. Variant of Glenna. Famous bearer: actress Glenn Close. | F | |
| 502 | Glenn | Gaelic | Derived from the Gaelic 'gleana', meaning valley. Used both as a surname and given name. Famous bearer: Canadian actor Glenn Ford. | M | |
| 503 | Glenna | Gaelic | Feminine form of Glen or Glenn, derived from the Gaelic 'gleana', meaning valley, or from the glen. | F | |
| 504 | Glenne | Gaelic | Valley. From the glen. | F | |
| 505 | Glennis | Gaelic | From the glen. Valley. | F | |
| 506 | Glynis | Gaelic | From the glen. Valley. | F | |
| 507 | Glynn | Gaelic | Valley. | M | |
| 508 | Glynnes | Gaelic | From the glen. Valley. | F | |
| 509 | Glynnis | Gaelic | From the glen. Valley. | F | |
| 510 | Godfrey | Gaelic | God's peace. | M | |
| 511 | Goraidh | Gaelic | God's peace. | M | |
| 512 | Gordain | Gaelic | Hero. | M | |
| 513 | Gordan | Gaelic | Hero. | M | |
| 514 | Gorman | Gaelic | Little blue eyed one. | M | |
| 515 | Gow | Gaelic | A smith. | M | |
| 516 | Gradey | Gaelic | Noble. | M | |
| 517 | Grady | Gaelic | Noble. | M | |
| 518 | Grainne | Gaelic | Grace. | F | |
| 519 | Guin | Gaelic | Blond. | M | |
| 520 | Guthrie | Gaelic | Free wind. | M | |