| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 121 | Glinys | Welsh | Little valley. | F | |
| 122 | Glyn | Welsh | Fair; good. | F | |
| 123 | Glynae | Welsh | Variant of Glenda. Fair; good. | F | |
| 124 | Glynda | Welsh | Fair; good. | F | |
| 125 | Glynis | Welsh | Little valley. Famous bearer: British twentieth century actress Glynis Johns. | F | |
| 126 | Glynn | Welsh | Fair; good. From the glenn. | F | |
| 127 | Glynnis | Welsh | Variant of Glenda. Fair; good. | F | |
| 128 | Goewin | Welsh | Legendary daughter of Pebin. | F | |
| 129 | Goleuddydd | Welsh | Bright day. | F | |
| 130 | Gorasgwrn | Welsh | Legendary daughter of Nerth. | F | |
| 131 | Gorawen | Welsh | Joy. | F | |
| 132 | Guenevere | Welsh | Fair one. Guinevere was King Arthur's mythological queen. Jennifer derives from this name. | F | |
| 133 | Guinevere | Welsh | From the name Gwenhwyfar, meaning fair and yielding. | F | |
| 134 | Gwaeddan | Welsh | Legendary daughter of Kynvelyn. | F | |
| 135 | Gwanwyn | Welsh | Spring. | F | |
| 136 | Gwen | Welsh | Diminutive of Gwendoline: Fair. Blessed. White browed. White circle. | F | |
| 137 | Gwenabwy | Welsh | Legendary daughter of Caw. | F | |
| 138 | Gwenda | Welsh | Diminutive of Gwendoline: Fair. Blessed. White browed. White circle. | F | |
| 139 | Gwendelyn | Welsh | Fair. Blessed. White browed. White circle. | F | |
| 140 | Gwendi | Welsh | Fair; blessed. | F | |