| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| IONATÁN | - | Irish | ||
| IONATHAN | - | Biblical Greek, Biblical Latin | ||
| IONE | ie-O-nee (English), IE-o-nee (English), ie-ON (English) | Greek Mythology, English | ||
| IONEL | yo-NEL | Romanian | ||
| IONELA | yo-NEL-ah | Romanian | ||
| IONUȚ | - | Romanian | ||
| IORAM | - | Biblical Latin, Biblical Greek | ||
| IORDAN | - | Bulgarian | ||
| IORWERTH | - | Welsh | ||
| IOSAPHAT | - | Biblical Latin, Biblical Greek | ||
| IOSEB | - | Georgian | ||
| IOSEPH | - | Biblical Greek, Biblical Latin | ||
| IOSEPHUS | - | Late Roman | ||
| IOSES | - | Biblical Greek | ||
| IOSIAS | - | Biblical Latin, Biblical Greek |