| Inger | | - | Swedish, Norwegian, Danish | |
| Ingolf | | ING-gawlf (German) | Swedish, Norwegian, Danish, German | |
| Ingrid | | ING-rid (Swedish), ING-ree (Norwegian), ING-grit (German) | Swedish, Norwegian, Danish, German | |
| Ingvar | | - | Swedish, Icelandic, Norwegian, Danish | |
| Irene | | ie-REEN (English), ie-REE-nee (English), ee-RE-ne (Italian), EE-re-ne (Finnish), ee-RE-nu (German) | English, Italian, Spanish, Portuguese, Swedish, Norwegian, Danish, Finnish, German, Ancient Greek (L | |
| Iris | | IE-ris (English), EE-ris (German, Dutch), EE-rees (Finnish, Spanish) | Greek Mythology, English, German, Dutch, Swedish, Norwegian, Danish, Finnish, French, Spanish | |
| Isabella | | ee-zah-BEL-lah (Italian), iz-ə-BEL-ə (English) | Italian, German, English, Swedish, Norwegian, Danish, Dutch, Romanian | |
| Isak | | EE-sahk | Swedish, Norwegian, Danish | |
| Ivar | | EE-vahr (Swedish, Norwegian) | Swedish, Norwegian, Danish | |
| JØRg | | - | Danish, Norwegian | |
| JØRgen | | - | Danish, Norwegian | |
| JØRn | | - | Danish, Norwegian | |
| Jacob | | JAY-kəb (English), YAH-kawp (Dutch) | English, Dutch, Swedish, Norwegian, Danish, Jewish, Biblical | |
| Jacobine | | yah-ko-BEE-nə (Dutch) | Norwegian, Danish, Dutch | |
| Jakob | | YAH-kawp (German), YAH-kob (Danish) | German, Swedish, Norwegian, Danish, Icelandic, Dutch, Slovene | |