| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Isador | IZ-a-dawr | English (Rare) | ||
| Isaia | - | Italian | ||
| Isaiah | ie-ZAY-ə (English), ie-ZIE-ə (English) | English, Jewish, Biblical | ||
| Isaias | - | Biblical | ||
| Isaija | - | Serbian, Macedonian | ||
| Isak | EE-sahk | Swedish, Norwegian, Danish | ||
| 'Isam | - | Arabic | ||
| Isamu | ee-sah-moo | Japanese | ||
| Isaura | ee-SOW-rah (Spanish) | Portuguese, Spanish, Late Roman | ||
| Isaurus | - | Late Roman | ||
| Isay | - | Russian | ||
| Isbel | IZ-bel | English (Rare) | ||
| Isbrand | - | Ancient Germanic | ||
| Iscah | - | Biblical | ||
| Isebella | iz-ə-BEL-ə | English (Rare) |