| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Ioakeim | - | Judeo-Christian Legend | ||
| Ioan | - | Romanian, Welsh, Bulgarian | ||
| Ioann | - | Russian | ||
| Ioannu | - | Old Church Slavic | ||
| Iola | - | English | ||
| Iolanda | - | Italian, Portuguese, Romanian | ||
| Iolanthe | ie-ə-LAN-thee (English) | Various | ||
| Iolo | - | Welsh | ||
| Iolyn | - | Welsh | ||
| Iomhar | - | Scottish | ||
| Ion (1) | YON (Romanian) | Basque, Romanian | ||
| Iona (1) | ie-ON-ə (English) | English, Scottish | ||
| Iona (2) | - | Russian, Georgian, Biblical Latin | ||
| IonatÁN | - | Irish | ||
| Ione | ie-O-nee (English), IE-o-nee (English), ie-ON (English) | Greek Mythology, English |