| N A M E | O R I G I N | M E A N I N G |
| Ion | Celtic/Gaelic | God is Good |
| Ionnes | Hebrew | Gift from God. |
| Iorgas | Greek | Farmer. |
| Iorwerth | Welsh | Worthy lord. Derived from 'ior' and 'gwerth'. Legendary son of Maredudd. |
| Iosep | Hebrew | God will multiply. |
| Ioseph | Hebrew | God will multiply. |
| Iov | Hebrew | God will estahlish. |
| Iphicles | Latin | Twin of Hercules. |
| Iphides | Greek | Hercules' twin brother. |
| Iphis | Greek | Hanged himself over unrequited love. |
| Iphitus | Greek | Brother of Iole. |
| Ir | Biblical | Watchman; city; vision |
| Irad | Biblical | Wild ass, heap of empire, dragon. |
| Iram | Hebrew | Shining |
| Iravan | Hindu | son of Arjuna/Uloopi |
| Irenbend | Anglo-Saxon | Iron bend. |
| Iri | Biblical | Fire, light. |
| Irijah | Biblical | The fear of the Lord. |
| Irus | Greek | Challenged Odysseus on his return to Ithaca. |
| Irven | Celtic | White. |
| Irvin | Anglo-Saxon | lover of the sea |
| Irvine | English | Friend. See also Ervin. |
| Irving | Celtic | handsome, fair |
| Irving.-irvin | Scottish | Variant of Irvine: Friend. Both a surname and place name. |
| Irvyn | Celtic | White. |
| Irwin | Anglo-Saxon | Sea lover. |
| Irwyn | Anglo-Saxon | Sea lover. |
| Isaac | Hebrew | laughing one |
| Isaakios | Hebrew | Child of laughter. |
| Isadorer | Greek | Strong gift. |
