| Irving | - | United States Name | Irwan | - | Indonesian Name |
| Irwin | - | Swiss Name | Irya | - | Indian Name |
| Irya | - | Hindu Name | Isa | - | Muslim Name |
| Isaac | - | English Name | Isaak | - | Hebrew Name |
| Isaak | - | Swiss Name | Isaako | - | West Indies Name |
| Isabelo | - | Philippines Name | Isac | - | Portuguese Name |
| Isad | - | Turkish Name | Isagani | - | Philippines Name |
| Isaiah | - | English Name | Isaiarasu | - | Indian Name |
| Isaias | - | Spanish Name | Isaias | - | Philippines Name |
| Isaïe | - | Cyprien Name | Isaivalan | - | Indian Name |
| Ísak | - | Icelandic Name | Isak | - | Norse Name |
| ISAM | - | Muslim Name | Isar | - | Indian Name |
| Isara | - | Thai Name | Isarrak | - | Eskimo Name |
| Isauro | - | Philippines Name | Isbat | - | Turkish Name |
| Iscah | - | Biblical Name | Iscariot | - | Biblical Name |
| Isdernus | - | Arthurian Name |
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