| 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 | |
| JÖRan | | - | Swedish | |
| JÖRgen | | - | Swedish | |
| Jacob | | JAY-kəb (English), YAH-kawp (Dutch) | English, Dutch, Swedish, Norwegian, Danish, Jewish, Biblical | |
| Jakob | | YAH-kawp (German), YAH-kob (Danish) | German, Swedish, Norwegian, Danish, Icelandic, Dutch, Slovene | |
| Jan (1) | | YAHN (Dutch, Swedish, Norwegian, Polish, German) | Dutch, Swedish, Norwegian, Danish, Czech, Polish, Slovene, German, Catalan | |
| Janina | | yah-NEE-nah (Polish, German), YAH-nee-nah (Finnish) | Polish, Finnish, German, Swedish, Lithuanian | |
| Janna | | YAHN-nah (Dutch, Finnish), JAN-ə (English) | Dutch, Swedish, Finnish, English | |
| Janne (1) | | YAHN-ne | Finnish, Swedish | |
| Jannicke | | YAHN-nik-ke (Swedish) | Norwegian, Swedish, Danish | |