| Isak | - | Serbian Name | Ísak | - | Icelandic Name |
| Isaline | - | Cyprien Name | ISAM | - | Muslim Name |
| Isamar | - | American Name | Isamarie | - | Teutonic Name |
| Isana | - | Aramaic Name | Isanne | - | Teutonic Name |
| Isar | - | Indian Name | Isara | - | West Indies Name |
| Isarrak | - | Eskimo Name | Isatou | - | Cameroon Name |
| Isaura | - | Australian Name | Isaure | - | Cyprien Name |
| Isauro | - | Philippines Name | Isavella | - | Italian Name |
| Isbah | - | Muslim Name | Isbat | - | Turkish Name |
| Isbert | - | Teutonic Name | Iscah | - | Biblical Name |
| Iscariot | - | Biblical Name | Isdernus | - | Arthurian Name |
| Iseabal | - | Scottish Name | Isebella | - | Hebrew Name |
| Isela | - | American Name | Isele | - | Yiddish Name |
| Iser | - | Yiddish Name | Isfendiyar | - | Turkish Name |
| Isgerd | - | Norse Name | Ish | - | Hindu Name |
| Ish-pan | - | Biblical Name | Ish-tob | - | Biblical Name |
| Isha | - | Hindu Name | Isha | - | Yiddish Name |
| Ishaal | - | Muslim Name | Ishaan | - | United States Name |
| Ishaan | - | Hindu Name | Ishai | - | Assyrian Name |
| Ishak | - | Assyrian Name | Ishan | - | United States Name |
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