| Name | Group | Language of Origin | Languages of Use | Meaning/Translation or Related Words | US 2024 |
| Isa | Isabella | Hebrew | German, Dutch, English | God is perfection; or: God is my oath | |
| Isabella | Isabella | Hebrew | German, Spanish, Italian | God is perfection; or: God is my oath | #7 |
| Isamu | Isamu | Japanese | Kanji symbol, Japanese | courage, bravery | |
| Isis | Isis | Egyptian | German, English | maybe mistress of the throne | |
| Isko | Isko/Iska | Spanish | Tagalog | | |
| Ismene | Ismene | Old Greek | German, English | | |
| Israel | Israel | Hebrew | English | God contends, God rules | #279 |
| Iva | Ivo/Yvonne | Old High German | Italian | maybe the archer | |
| Ivanka | John/Johanna | Hebrew | Slavic | Yahweh is gracious | |
| Ivar | Ingvar | Old Norse | Scandinavian | Words: warrior | |
| Iwan | John/Johanna | Hebrew | Russian | Yahweh is gracious | |
| Jackson | Jackson | English | English | son of Jack | #35 |
| Jacqueline | Jacob/Jacqueline/Jakoba | Hebrew | French | Yahweh may protect; holder of the heel; supplanter | #589 |
| Jakoba | Jacob/Jacqueline/Jakoba | Hebrew | German | Yahweh may protect; holder of the heel; supplanter | |
| James | Jacob/Jacqueline/Jakoba | Hebrew | English | Yahweh may protect; holder of the heel; supplanter | #5 |
| Jana | John/Johanna | Hebrew | German, Czech | Yahweh is gracious | |
| Janice | John/Johanna | Hebrew | English | Yahweh is gracious | |
| Janina | John/Johanna | Hebrew | German, Polish | Yahweh is gracious | |
| Jarmila | Jarmil/Jarmila | Czech | German, Czech | Words: strong / dear | |
| Jarvis | Jarvis | English | English | | |
| Jason | Jason | Old Greek | English | Words: heal | #148 |
| Jeanne | John/Johanna | Hebrew | French | Yahweh is gracious | |
| Jena | Jennifer | Welsh | English | Words: white, fair, shining / smooth | |
| Jennifer | Jennifer | Welsh | German, English | Words: white, fair, shining / smooth | #546 |
| Jenny | Jennifer | Welsh | German, English | Words: white, fair, shining / smooth | |
| Jens | John/Johanna | Hebrew | German, Scandinavian | Yahweh is gracious | |
| Jérôme | Hieronymus/Hieronyma | Old Greek | French | sacred name | |
| Jitka | Judith | Hebrew | Czech | woman from Jehud | |
| Joan | John/Johanna | Hebrew | English | Yahweh is gracious | |
| Jody | Judith | Hebrew | English | woman from Jehud | |
| Johanna | John/Johanna | Hebrew | German, Dutch, Scandinavian | Yahweh is gracious | #847 |
| Johannes | John/Johanna | Hebrew | German | Yahweh is gracious | |
| Johnny | John/Johanna | Hebrew | English | Yahweh is gracious | #457 |
| Jole | Yolanda | Old Greek | Italian | violet | |
| José | Joseph/Josepha | Hebrew | Portuguese, Spanish | He (God) will add | |
| Josefa | Joseph/Josepha | Hebrew | Scandinavian, Portuguese, Spanish | He (God) will add | |
| Jovita | Jovita | Latin | Portuguese, Spanish | | |
| Joyce | Joyce | Breton | English | lord | |
| Judith | Judith | Hebrew | German, French, English | woman from Jehud | #831 |
| Juhani | John/Johanna | Hebrew | Finnish | Yahweh is gracious | |
| Julia | Julius/Julia | Latin | German, Portuguese, Spanish, English | Words: dedicated to Jupiter | #116 |
| Juliana | Julian/Juliana | Latin | German, Dutch, Portuguese, English, Spanish | | #250 |
| Julietta | Julius/Julia | Latin | Spanish, Italian | Words: dedicated to Jupiter | #972 |
| Juno | Juno | Latin | German | | |
| Justus | Justus/Justine | Latin | German | the just | |
| Jutta | Judith | Hebrew | German | woman from Jehud | |
| Kalle | Karl/Charlotte/Carla | Old High German | Scandinavian | Words: man, husband | |
| Kalliope | Kalliope | Old Greek | German, English | beautiful voice | |
| Kamel | Kamal | Arabic | Arabic | perfection | |
| Karel | Karl/Charlotte/Carla | Old High German | Dutch, Czech | Words: man, husband | |
| Karen | Karin | Old Greek | German, Scandinavian | maybe the pure | |
| Karin | Karin | Old Greek | German, Scandinavian, Finnish | maybe the pure | |
| Karlheinz | Karlheinz | German | German | | |
| Kassandra | Cassandra | Old Greek | German | Words: protrude / man | |
| Kate | Katherine | Old Greek | English | maybe the pure | #534 |
| Katharina | Katherine | Old Greek | German | maybe the pure | |
| Kathleen | Katherine | Old Greek | English | maybe the pure | |
| Kathryn | Katherine | Old Greek | German | maybe the pure | #716 |
| Kathy | Katherine | Old Greek | English | maybe the pure | |
| Katja | Katherine | Old Greek | German, Russian | maybe the pure | |
| Kato | Kato | Unknown | French | | |
| Kazuko | Kazuko | Japanese | Kanji symbol, Japanese | peace child | |
| Kazuya | Kazuya | Japanese | Kanji symbol, Japanese | Words: harmony, peace / be | |
| Keaton | Keaton | Old English | English | maybe shed town | #842 |
| Keiko | Keiko | Japanese | Kanji symbol, Japanese | happy child | |
| Kelsey | Kelsey/Kelsey | Old English | English | Words: ship / victory | #668 |
| Kelvin | Kelvin | Scottish | English | | |
| Kennedy | Kennedy/Kennedy | Old Irish | English, Scottish, Irish | ugly head | |
| Kenya | Kenya | Kamba | English | Kenya | |
| Kenzo | Kenzo | Japanese | Kanji symbol, Japanese | Words: healthy, health / three | #586 |
| Kerstin | Christian/Christine | Latin | Scandinavian | Christian, disciple of Christ | |
| Kira | Cyrus/Kyra | Old Persian | Russian | Words: lord | #455 |
| Kitty | Katherine | Old Greek | English | maybe the pure | |
| Kleopatra | Kleopatra | Old Greek | German | Words: glory / father | |
| Klotilde | Klothilde | Old High German | German | Words: loud, famous / fight | |
| Knud | Knut | Old Norse | German, Scandinavian | knot | |
| Kobe | Kobe | Swahili | English | tortoise | #408 |
| Koen | Conrad/Konrada | Old High German | Dutch | Words: bold / counsel, advice, advisor | #681 |
| Konradin | Conrad/Konrada | Old High German | German | Words: bold / counsel, advice, advisor | |
| Konstantin | Konstantin/Konstanze | Latin | German, Bulgarian, Hungarian, Russian | the steadfast | |
| Kordula | Cordula | Latin | German | | |
| Kraft | Kraft | Old High German | German | Words: strength, power | |
| Kriemhild | Kriemhild | Old High German | German | Words: mask, helmet / fight | |
| Kristina | Christian/Christine | Latin | Scandinavian | Christian, disciple of Christ | |
| Kumiko | Kumiko | Japanese | Kanji symbol, Japanese | long time beautiful child | |
| Kunigunde | Kunigunde | Old High German | German | Words: tribe, clan / fight | |
| Lamberta | Lambert/Lamberta | Old High German | German, Dutch | Words: land, homeland / bright | |
| Lambrecht | Lambert/Lamberta | Old High German | German | Words: land, homeland / bright | |
| Lane | Lane | Old English | English | lane | #261 |
| Larissa | Larissa | Old Greek | German, Russian | maybe the lovely | |
| Lätitia | Lätitia | Latin | German | Words: joy, happiness | |
| Laura | Laurence/Laura | Latin | German, Spanish, Portuguese, Italian, English, Hungarian | Words: laurel | #358 |
| Laurel | Laurence/Laura | Latin | English | Words: laurel | #727 |
| Lauretta | Laurence/Laura | Latin | German, Italian | Words: laurel | |
| Laverna | Laverna | Latin | English | | |
| Lawrence | Laurence/Laura | Latin | English | Words: laurel | #509 |
| Lazzaro | Lazarus | Hebrew | Italian | God has helped | |
| Leda | Leda | Old Greek | German, English | | |
| Lee | Lee/Lee | Old English | English | meadow | #714 |
| Lena | Helen | Old Greek | German, Scandinavian | maybe the torch | #263 |