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| Name | Meaning | Gender | Origin |
| Grizelda | Endless Patience | F | German |
| Grizzel | Variant of Griselda: From the Old German/ meaning 'grey battle' or 'Christian battle'. | F | German |
| Gro | Gardener. | F | Norse |
| Groa | Gardener. | F | Norse |
| Groffudd | Strong warrior/ lord. | M | Welsh |
| Groot | Large. | M | Dutch |
| Grosvenor | Great hunter. | M | French |
| Grover | From the Grove | M | English |
| Gruddieu | Mythical son of Muriuel. | M | Celtic |
| Gruddyeu | Legendary son of Muryel. | M | Welsh |
| Gruev | Vigilant. | M | Greek |
| Gruffen | Fierce lord. | M | Welsh |
| Gruffin | Fierce lord. | M | Welsh |
| Gruffudd | Red haired. | M | Welsh |
| Gruffyn | Fierce lord. | M | Welsh |
| Grufydd | Red haired. | M | Welsh |
| Grumio | The Taming of the Shrew' A servant to Petruchio. | M | Shakespearean |
| Gryfflet | Killed by Lancelot. | M | Arthurian Legend |
| Gryne | An Amazon. | F | Latin |
| Gryphin | Strong in faith. | M | Welsh |
| Gryphon | Mythological Beast | E | Greek |
| Gryselda | Gray; gray-haired. Italian author Giovanni Boccaccio's used the name for an exceptionally patient fictional wife - thus the expression 'patience of Griselda. | F | German |
| Gryta | Pearl | F | Greek |
| Guadalupe | River of Black Stones | E | Spanish |
| Guadelupe | All Nationalities | ||
| Gualterio | Spanish form of Walter 'strong warrior'. | M | Spanish |
| Gualtier | From the name WALTER | M | Italian |
| Gualtiero | Italian form of Walter 'strong warrior'. | M | Italian |
| Guang | Light | M | Chinese |
| Guanhamara | Arthur's queen. | F | Arthurian Legend |
| Guanhumora | Arthur's queen. | F | Arthurian Legend |
| Guban | Burnt | M | African |
| Gubnat | Irish form of Abigail: brings joy. | F | Irish |
| Guda | Supreme. | F | Swedish |
| Gudbrand | Weapon of the gods. | M | Norse |
| Gudbrande | Weapon of the gods. | M | Norse |
| Gudmund | A chieftain. | M | Norse |
| Gudny | Unspoiled. | F | Swedish |
| Gudrid | Divinely inspired wisdom. | F | Norse |
| Gudrun | Battler | F | Scandinavian |
| Gudruna | Divine knowledge. | F | German |
| Guebers | Followers of ancient Persian religion. | M | Persian |
| Guendolen | White. | F | English |
| Guenevere | Fair One | F | Welsh |
| Guenloie | A queen. | F | Arthurian Legend |
| Guennola | White. | F | Celtic |
| Guerehes | Brother of Gawain. | M | Arthurian Legend |
| Guffd | Serpent god. | M | Indian |
| Guglielmo | Resolute protector. | M | Italian |
| Guglilmo | Resolute guardian. | M | Teutonic |