| Name | Gender | What it Means | Origin |
| IAGO | Male | Supplanter | Latin |
| IAIN | Male | God is Gracious | Celtic/Gaelic |
| IAN | Male | God is Gracious | Celtic/Gaelic |
| IANNA | Female | Fem. form of IAN | Celtic/Gaelic |
| IANTHE | Female | Violet, Colored Flower | Greek |
| IBTESAM | Female | Smiling | Arabic |
| ICHABOD | Male | Departed Glory | Hebrew |
| IDA | Female | Hardworking | German |
| IDALEE | Female | From IDA and LEE | American |
| IDALIA | Female | From IDALEE | American |
| IDANA | Female | From IDA & ANNA | American |
| IDANIA | Female | Hardworking, Prosperous | Slavic |
| IDE | Female | Thirst | Celtic/Gaelic |
| IDEN | Both | Prosperous | English |
| IDOLA | Female | Vision | Greek |
| IDRA | Female | Fig tree | Hebrew |
| IDRIS | Both | Fiery | Hindi |
| IFAMA | Female | All is Well | African |
| IFE | Male | Wide, Love | African |
| IGE | Male | Born by Breech | African |
| IGGI | Male | Only Son | African |
| IGGY | Male | From the name IGGI | African |
| IGNATIUS | Male | Firey One | English |
| IKE | Male | From the name ISAAC | Hebrew |
| IKIA | Female | God is my Salvation | Hebrew |
| ILANA | Female | Great Tree | Hebrew |
| ILANDERE | Female | Moon Woman | American |
| ILAR | Both | Cheerful | Welsh |
| ILARIO | Male | Cheerful | Italian |
| ILIANA | Female | Bright | Greek |
| ILITHYA | Female | Goddess of Women in Labor | Greek |
| ILLIAS | Male | Jehovah is my God | Greek |
| ILO | Male | Light, Joyous, Sunshine | African |
| ILOM | Male | My Enemies Are Many | African |
| ILONA | Female | Beautiful, sunshine | Hungarian |
| ILORI | Female | Special Treasure | African |
| ILSE | Female | Consecrated to God | German |
| ILYA | Male | From Elijah | Russian |
| ILYSSA | Female | Rational | Hebrew |
| IMALA | Female | Disciplinarian | Native American |
| IMAN | Female | Faith | African |
| IMARAN | Male | Strong | Hindi |
| IMOGENE | Female | Image, Likeness | Latin |
| INA | Female | Pure | Greek |
| INARA | Female | Ray of light – Heaven sent | Arabic |
| INARI | Female | Shrimp | Japanese |
| INCE | Male | Innocent | Hungarian |
| INDEPENDENCE | Female | Freedom | American |
| INDIA | Female | From India | English |
| INDIRA | Female | God of Heaven & Thunderstorms | Hindi |
| INDIVAR | Male | Blue Lotus | Hindi |
| INDIYA | Female | Philosophical one | American |
| INDRA | Female | God of Rain & Thunder | Hindi |
| INEZ | Female | Meek | Spanish |
| INFINITY | Both | Endless | American |
| INGA | Female | From the name INGRID | Scandinavian |
| INGE | Female | Island | Scandinavian |
| INGO | Male | Male leader | Scandinavian |
| INGRID | Female | A Meadow | Scandinavian |
| INIGO | Male | Ardent | Portuguese |
| INIKO | Female | Born During Troubled Times | African |
| INOCENCIA | Female | Innocent | Spanish |
| INOKE | Female | Devoted | Hawaiian |
| IOKINA | Female | God will Develop | Hawaiian |
| IOLA | Female | Violet-Colored Dawn | Welsh |
| IOLANA | Female | Soar Like An Eagle | Hawaiian |
| IOLANI | Female | Royal Hawk | Hawaiian |
| ION | Male | God is Good | Celtic/Gaelic |
| IONA | Female | Purple Jewel | Greek |
| IORWEN | Female | Lord, Beautiful | Welsh |
| IPHIGENIA | Female | Mythological Creature | Greek |
| IPHIGENIE | Female | Mythical Creature | French |
| IPO | Female | Darling | Hawaiian |
| IRA | Male | Watchful, Descendant | Hebrew |
| IRAM | Male | Shining | Hebrew |
| IRELAND | Both | Homage to Ireland | American |
| IREN | Female | Peace | Greek |
| IRENE | Female | Peaceful | Greek |
| IRIA | Female | From the name IRIS | English |
| IRINA | Female | Peaceful | Slavic |
| IRIS | Female | Colorful, Rainbow | Greek |
| IRISA | Female | Iris | English |
| IRISH | Both | From Ireland | American |
| IRMA | Female | Complete one | German |
| IRVING | Male | Handsome and Fair | English |
| ISAAC | Male | He will laugh | Hebrew |
| ISABEL | Female | Consecrated to God | Spanish |
| ISABELLA | Female | Consecrated to God | Italian |
| ISABELLE | Female | Consecrated to God | French |
| ISABIS | Female | Something Beautiful | African |
| ISADORA | Female | Gift of Isis | Latin |
| ISAIAH | Male | Salvation by God | Hebrew |
| ISANNE | Female | From ISABEL and ANNE | American |
| ISAURA | Female | Soft Air | Greek |
| ISHA | Female | Woman | Hebrew |
| ISHANA | Female | Prosperous | Hindi |
| ISHMAEL | Male | God Will Hear | Hebrew |
| ISI | Female | Consecrated to God | Spanish |
| ISIS | Female | Supreme Goddess of the stars | Egyptian |
| ISLA | Female | Island | Celtic/Gaelic |
| ISLEEN | Female | Form of EILEEN | Celtic/Gaelic |
| ISMAEL | Male | God Will Hear | Hebrew |
| ISMAELA | Female | God Listens | Hebrew |
| ISMAIL | Male | God will Hear | Hebrew |
| ISMET | Male | Honor | Turkish |
| ISOKE | Female | Gift from God | African |
| ISOLDE | Female | Fair One | Welsh |
| ISRA | Both | Freedom | Turkish |
| ISRAEL | Male | Prince of God | Hebrew |
| ISSAY | Male | Hairy | African |
| ISTAS | Female | Snow | Native American |
| ITA | Female | Thirsty | Italian |
| ITALIA | Female | Italy | Italian |
| IVAN | Male | God is good | Slavic |
| IVANA | Female | God is Gracious | Slavic |
| IVI | Female | Ivy Plant | English |
| IVIE | Female | From the name IVY | English |
| IVO | Male | cut wood | German |
| IVORY | Female | White as Elephant Tusks | Latin |
| IVRIA | Female | From the other side of the River | Hebrew |
| IVRIT | Male | The Hebrew Language | Hebrew |
| IVY | Female | A Vine | English |
| IWALANI | Female | Heavenly Seagull | Hawaiian |
| IZEFIA | Female | I have no child | African |
| IZZY | Male | He will Laugh | Hebrew |