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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|---|---|---|---|---|---|---|---|---|
| Isabel | 4 | Ivarsdottir | 1 | Ireland | 45 | IX | 1 | Isenburg, Von | 1 |
| Isle, L' | 2 | Islay | 1 | Innes | 1 | Irene | 1 | Issoudun | 1 |
| Isles | 4 | Italy | 4 | Ingern, Von | 1 | Isobel | 2 | Isenberg | 1 |
| Ivarsson | 3 | Idwal | 5 | Ingersol | 1 | Izyaslawl | 1 | Inge | 1 |
| Isabella | 1 | Ithon | 1 | Irmina | 1 | Istvan | 1 | Itter, Von | 2 |
| Ifor | 4 | Ingerina | 1 | Ivetta | 1 | Issoudun, d' | 1 | Iestyn | 1 |
| Ithel | 5 | Ilid | 1 | Ivrea | 1 | Ingrid | 1 | Ivy | 1 |
| Idwallon | 1 | Ireland, St. | 1 | Insula, De | 2 | Ingard | 1 | Innermay | 1 |
| Irmgard | 2 | Ivor | 1 | Ingjaldsson | 2 | Ince | 1 | Istria | 1 |
| Iceni | 1 | Idoine | 1 | Israel | 2 | Ince, de | 2 | Iniguez | 2 |
| Icenians | 1 | Ingenach | 1 | Ieuan | 11 | Isham | 4 | - | - |
| Imaneuntus | 1 | Indulph | 1 | Ingild | 1 | Iaceu | 1 | - | - |
| Ida | 4 | Ingibjorg | 1 | Ivrea, De | 3 | Iago | 2 | - | - |
| Iorwerth | 7 | Ile | 1 | Ieuaf | 1 | Ijsselstein, van | 2 | - | - |