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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|---|---|---|---|---|---|---|---|---|
| Italy | 8 | Ivarsson | 5 | Iniguez | 2 | Iowerth | 2 | Ibelin | 3 |
| Iddenden | 2 | Istrie | 1 | Ingerina | 1 | Iowerth Hirvland | 1 | Ifor | 2 |
| Isaac | 7 | Ivoix, of Chiny | 1 | Isar | 1 | Iarddur | 1 | Ieuan | 2 |
| Ingelrica | 1 | Isles | 4 | Isengau | 3 | Idnerth | 1 | Ismail | 1 |
| Iorwerth | 6 | Iorwerth Idnerth | 1 | Inngau | 1 | Idwallon | 1 | Ingram | 3 |
| Ieuaf | 2 | Iscoed | 1 | Iverfort | 1 | Iaceu | 2 | Inwardly | 2 |
| Ivrea | 9 | Idwal | 1 | Ingelheim | 1 | Inethan | 1 | Iwardby | 1 |
| Idwal Foel | 1 | Isle | 15 | Ithel | 5 | Iasedd | 1 | Ingeram | 2 |
| Idwal ap Meurig | 1 | Ingjaldsson | 2 | Iceni | 2 | Ivoix | 2 | Ingleton | 2 |
| Iago | 2 | Ingvarsson | 2 | Invader | 1 | Ingesdottir | 1 | - | - |
| Ial | 1 | Ivarsdatter | 1 | Indellach | 1 | Iestyn | 2 | - | - |
| Insula | 5 | Inge | 2 | Islay | 1 | Illey | 3 | - | - |
| Ireland | 22 | Istria | 7 | Iuchdelb | 1 | Issoudun | 1 | - | - |