| Iouanaul | God is gracious |
| Iovenali | A name meaning youthful one. |
| Ipa | A name meaning a peaceful soul. |
| Ipela | A name meaning to be joyful or happy. |
| Ippa | A name meaning a small, humble gift. |
| Irgen | A name meaning a noble, strong leader. |
| Irminric | A name meaning a powerful universe. |
| Irom | A name meaning a strong, iron spirit. |
| Ironside | Strong and steadfast |
| Isaacs | A name meaning one who will laugh. |
| Isack | Laughter; One who Laughs |
| Isambard | Divine strength |
| Isfael | A name meaning God is my salvation. |
| Ishom | A name meaning a peaceful, calm soul. |
| Ison | A name meaning a son of the ice. |
| Isral | A name meaning one who fights God. |
| Itermon | Sea of bitterness |
| Ithail | A name meaning dew of God. |
| Iudcant | A name meaning a singer. |
| Iudgual | From the Old English 'iudgual,' meaning 'judgment' or 'decision.' |
| Iudguallaun | Derived from the Old English 'iudgallaun,' meaning 'judgment of the people.' |
| Iudguallon | From the Old English 'iudgallon,' meaning 'judgment of the lord.' |
| Iudguoret | Derived from the Old English 'iudguoret,' meaning 'judgment of the people's lord.' |
| Iudhail | From the Old English 'iudhail,' meaning 'judgment of the people's lord.' |
| Iudhubr | Derived from the Old English 'iudhubr,' meaning 'judgment of the people's ruler.' |
| Iudic | From the Latin 'iudic,' meaning 'to judge.' |
| Iunet | Derived from the Old English 'iunet,' meaning 'youth' or 'young.' |
| Iurthir | From the Old English 'iurthir,' meaning 'youth' or 'young warrior.' |
| Iuthel | Derived from the Old English 'iuthel,' meaning 'youth' or 'young noble.' |
| Iuvenalus | From the Latin 'iuvenalis,' meaning 'youthful' or 'young.' |
| Ivdnert | Derived from the Old English 'ivdnert,' meaning 'young lord' or 'noble youth.' |
| Ivomagus | From the Latin 'ivomagus,' meaning 'young noble' or 'youthful lord.' |
| Iekki | A variant of the name Iikka or Iisak. |
| Iekko | A rare Finnish name of unknown origin. |
| Iekku | A diminutive form of the name Iisak. |
| Iemel | Imitating; Rivalling |
| Iemi | Imitating; Rivalling |
| Ienokki | Devoted; Dedicated |
| Ietu | A Finnish variant of the name Edward. |
| Ihannus | God is Gracious |