| Name | Group | Language of Origin | Languages of Use | Meaning/Translation or Related Words | US 2021 |
|---|
| Iver | Ingvar | Old Norse | Scandinavian | Words: warrior | |
| Ivor | Ingvar | Old Norse | English | Words: warrior | |
| Jadwiga | Hedwig | Old High German | Polish | Words: fight, battle / fight, battle, war | |
| Jalmari | Hjalmar | Old Norse | Finnish | helmeted warrior | |
| Jano | Alexander/Alexandra | Old Greek | German | he who wards off (other) men, defender of men | |
| Jari | Hjalmar | Old Norse | Finnish | helmeted warrior | |
| Jaromierz | Jaromir | Old Slavic | Polish | Words: peace | |
| Jaromir | Jaromir | Old Slavic | Czech | Words: peace | |
| Jarred | Gerard/Gerharde | Old High German | English | Words: spear / brave, hardy | |
| Jarrett | Gerard/Gerharde | Old High German | English | Words: spear / brave, hardy | |
| Jaya | Jaya | Sanskrit | Malay | successful, victorious | |
| Jeff | Geoffrey | Germanic | English | Words: region, area / stranger / peace, protection | |
| Jeffery | Geoffrey | Germanic | English | Words: region, area / stranger / peace, protection | |
| Jeffrey | Geoffrey | Germanic | English | Words: region, area / stranger / peace, protection | #424 |
| Jehoschafat | Josaphat | Hebrew | German | Yahweh has judged | |
| Jehoshaphat | Josaphat | Hebrew | English | Yahweh has judged | |
| Jelle | William/Wilhelma | Old High German | Dutch | Words: will, desire / helmet, protection | |
| Jelte | William/Wilhelma | Old High German | Frisian | Words: will, desire / helmet, protection | |
| Jerald | Gerald/Geraldine | Old High German | English | Words: spear / rule | |
| Jerica | Gertrud | Old High German | English | Words: spear / strength, power | |
| Jerika | Gertrud | Old High German | English | Words: spear / strength, power | |
| Jerry | Gerald/Geraldine | Old High German | German, English | Words: spear / rule | |
| Josafat | Josaphat | Hebrew | German | Yahweh has judged | |
| Josaphat | Josaphat | Hebrew | German, English | Yahweh has judged | |
| Kane | Cathán | Old Irish | English, Irish | Words: battle | #329 |
| Kang | Kang | Mandarin | Kanji symbol, Mandarin | peaceful, happy, healthy | |
| Kasimir | Casimir | Polish | German | Words: destroy / great, famous / peace | |
| Katla | Kettil/Katla | Old Norse | Scandinavian, Icelandic | Words: kettle, helmet | |
| Katsumi | Katsumi | Japanese | Kanji symbol, Japanese | self-control | |
| Kazimir | Casimir | Polish | Russian | Words: destroy / great, famous / peace | |
| Kazuko | Kazuko | Japanese | Kanji symbol, Japanese | peace child | |
| Kazumi | Kazumi | Japanese | Kanji symbol, Japanese | harmony and beauty | |
| Kazuya | Kazuya | Japanese | Kanji symbol, Japanese | Words: harmony, peace / be | |
| Kelcie | Kelsey/Kelsey | Old English | English | Words: ship / victory | |
| Keld | Kettil/Katla | Old Norse | Scandinavian | Words: kettle, helmet | |
| Kelian | Cillian | Old Irish | French | maybe war, strife | |
| Kelsea | Kelsey/Kelsey | Old English | English | Words: ship / victory | |
| Kelsey | Kelsey/Kelsey | Old English | English | Words: ship / victory | |
| Kelsey | Kelsey/Kelsey | Old English | English | Words: ship / victory | #622 |
| Kelsi | Kelsey/Kelsey | Old English | English | Words: ship / victory | |
| Kelsie | Kelsey/Kelsey | Old English | English | Words: ship / victory | |
| Kelyan | Cillian | Old Irish | French | maybe war, strife | |
| Kenelm | Kenelm | Old English | English | Words: helmet, protection | |
| Kennard | Kennard | Old English | English | Words: royal / warden, guard | |
| Kerttu | Gertrud | Old High German | Finnish | Words: spear / strength, power | |
| Kettil | Kettil/Katla | Old Norse | Scandinavian | Words: kettle, helmet | |
| Kilian | Cillian | Old Irish | German, English | maybe war, strife | |
| Killian | Cillian | Old Irish | German, English | maybe war, strife | #347 |
| Kilyan | Cillian | Old Irish | French | maybe war, strife | |
| Kimball | Kimball | Welsh | English | war chief | |
| Kinga | Kunigunde | Old High German | Hungarian, Polish | Words: tribe, clan / fight | |
| Kinsey | Kinsey | Old English | English | royal victory | |
| Kjartan | Kjartan | Old Irish | Icelandic | Words: sea / warrior | |
| Kjeld | Kettil/Katla | Old Norse | Scandinavian | Words: kettle, helmet | |
| Kjell | Kettil/Katla | Old Norse | Scandinavian | Words: kettle, helmet | |
| Kjetil | Kettil/Katla | Old Norse | Scandinavian | Words: kettle, helmet | |
| Klaas | Nicholas/Nicole | Old Greek | German, Dutch, Low German | victory of the people | |
| Klothilde | Klothilde | Old High German | German | Words: loud, famous / fight | |
| Klotild | Klothilde | Old High German | Hungarian | Words: loud, famous / fight | |
| Klotilda | Klothilde | Old High German | German | Words: loud, famous / fight | |
| Klotilde | Klothilde | Old High German | German | Words: loud, famous / fight | |
| Koa | Koa | Hawaii | English, Hawaii | warrior | #546 |
| Kolja | Nicholas/Nicole | Old Greek | Russian | victory of the people | |
| Kouhei | Kouhei | Japanese | Kanji symbol, Japanese | maybe calm peace | |
| Krasimir | Kresimir | Slavic | Bulgarian | Words: peace | |
| Kreshnik | Kreshnik | Albanian | Albanian | knight | |
| Kresimir | Kresimir | Slavic | Slavic | Words: peace | |
| Krew | Carew | Welsh | English | Words: castle, fortress | #624 |
| Kriemhild | Kriemhild | Old High German | German | Words: mask, helmet / fight | |
| Kriemhilde | Kriemhild | Old High German | German | Words: mask, helmet / fight | |
| Krimhild | Kriemhild | Old High German | German | Words: mask, helmet / fight | |
| Krimhilde | Kriemhild | Old High German | German | Words: mask, helmet / fight | |
| Kunegunda | Kunigunde | Old High German | Polish | Words: tribe, clan / fight | |
| Kunigonde | Kunigunde | Old High German | Dutch | Words: tribe, clan / fight | |
| Kunigunda | Kunigunde | Old High German | German, Slavic | Words: tribe, clan / fight | |
| Kunigunde | Kunigunde | Old High German | German | Words: tribe, clan / fight | |
| Kuniza | Kunigunde | Old High German | German | Words: tribe, clan / fight | |
| Kushtrim | Kushtrim | Albanian | Albanian | slogan, battle cry | |
| Kylian | Cillian | Old Irish | German, English | maybe war, strife | #778 |
| Kyllian | Cillian | Old Irish | French | maybe war, strife | |
| Lajos | Ludwig/Louise | Old High German | Hungarian | Words: loud, famous / fight, battle, war | |
| Laoise | Ludwig/Louise | Old High German | Irish | Words: loud, famous / fight, battle, war | |
| Lawley | Lawley | Old English | English | Words: survisor, remnant / wood, clearing, meadow | |
| Ledger | Ledger | Old French | English | Words: people / spear | #574 |
| Leka | Alexander/Alexandra | Old Greek | Albanian | he who wards off (other) men, defender of men | |
| Leman | Solomon/Salome | Hebrew | Malay | the peaceful | |
| Lester | Lester | Old English | English | Words: Roman fort | |
| Lewis | Ludwig/Louise | Old High German | English | Words: loud, famous / fight, battle, war | #485 |
| Lex | Alexander/Alexandra | Old Greek | German, English | he who wards off (other) men, defender of men | |
| Lexi | Alexander/Alexandra | Old Greek | English | he who wards off (other) men, defender of men | #415 |
| Lexie | Alexander/Alexandra | Old Greek | English | he who wards off (other) men, defender of men | #899 |
| Li | Li | Mandarin | Kanji symbol, Mandarin | power, strength | |
| Liam | William/Wilhelma | Old High German | Irish | Words: will, desire / helmet, protection | #1 |
| Lidia | Lydia | Old Greek | German, English | woman from Lydia | |
| Lidija | Lydia | Old Greek | Slavic | woman from Lydia | |
| Liebgard | Liebgard | Old High German | German | Words: dear, beloved / fence, enclosure, protection | |
| Liudger | Ludger/Ludgera | Old High German | German | Words: people / spear | |
| Liv | Liv | Old Norse | German, Scandinavian | Words: protection / life | #685 |
| Liva | Liv | Old Norse | Scandinavian | Words: protection / life | |
| Live | Liv | Old Norse | Scandinavian | Words: protection / life | |
