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| Ian | Variant of John |
| Ibrahim | Variant of Abraham |
| Ignace | Variant of Ignaz |
| Ignacio | Variant of Ignaz |
| Ignaz | Ignaz |
| Ignazio | Variant of Ignaz |
| Ilja | Variant of Elijah |
| Immanuel | Variant of Manuel |
| Infant | Variant of Baby |
| Ioannis | Variant of John |
| Irvin | Variant of Erwin |
| Irving | Irving |
| Isaac | Isaac |
| Isaak | Variant of Isaac |
| Isai | Variant of Jesse |
| Isaiah | Isaiah |
| Isaias | Variant of Isaiah |
| Ishmael | Ishmael |
| Isiah | Variant of Isaiah |
| Isidore | Isidore |
| Isidro | Variant of Isidore |
| Ismael | Variant of Ishmael |
| Israel | Israel |
| Issac | Variant of Isaac |
| Ivan | Variant of John |
| Iwan | Variant of John |