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- Iacono, Iaconoe, Iaconow
- Iaz, Iazz, Ias
- Ibanez, Ibbanez, Ibanezz
- Ibarra, Ibar, Valley, Hillside
- Ibbot, Ibot, Ibott, Isabel
- Ibrahim, Ibrahimn, Ibrahem, Ibrahimovic
- Ibson, Ibbson, Ibsson
- Ichardson, Ikhardson, Ickhardson
- Iddings, Idings, Idding
- Ide, Idde, Idd
- Ickes, Iches, Icke
- Igarashi, Arashi, Storm
- Igbal, Igball, Igballe
- Iglesias, Ecclesia, Church
- Ignacio, Iggnacio, Ignacios, Ignacz, Ignac
- Ignatiev, Son of Ignatiy, Ignatov, Ignat
- Igueroa, Igueria, Iguerria
- Ihejirika, Igbo, Greater
- Ikeda, Iketa, Field, Rice Paddy
- Ikin, Idan, Ida
- Ilbert, Hiliberht, Ilbertt
- Ilgen, Ilgin, Elgen
- Ilic, Ilija, Ilijan
- Iliescu, Ilie, Ilie
- Iliev, Son of Iliya
- Ill, Elle, Ell, Ills
- Iller, Illers, Eller
- Illiams, Illians, Illian
- Illis, Illes, Illise
- Ilson, Illson, Elson
- Ilva, Illva, Elva, Lynx
- Im, Lin, Ren
- Imai, Ima, Well, Pit
- Imani, Imanni, Immani
- Imenez, Imenes, Emenez
- Imes, Emes, Imis
- Imhoff, Imhof, Emhoff
- Immel, Imel, Imele
- Impson, Impsen, Impsonn
- Immons, Immens, Immon
- Inaba, Inaha, Leaf,
- Ince, Inc, Inke
- Infante, Infant, Inphante
- Ingalls, Engle, Ingals, Ingell, Ingle, Ingles, Inglis
- Inge, Ing, Enge, Inges, Ingersleben, Ingesson, Ingham
- Ingersoll, Ingersol, Ingerson
- Ingh, Ibghe, Engh
- Ingham, Ingam, Engham
- Inglis, Ingllis, Inglise
- Ingolfsson, Son of Ingolfr
- Ingraham, Inghram, Ingram, Ingrame
- Iglesias, Iglesia, Iglesa,
- Iniguez, Inigues, Eniguez, Inigo
- Inman, Innman, Inmon
- Innes, Innis, Ennis, Ines, Aonghus
- Innocenti, Innocent, Innacent
- Inoue, Inoui, Well, Pit
- Intyre, Intire, Entyre
- Ioannidis, Son of Ioannis
- Ionesco, Ionescu, Iones
- Iordanou, Ion, descend, Flowdown, Yarad
- Iorio, Iorioe, Iorrio
- Ipock, Ipocke, Epock
- Ippolito, Ipoloto, Ipolitto
- Iraheta, Irahetta, Irahette
- Irby, Irbie, Erby
- Ireland, Irelande, Irelan
- Irene, Irean, Irenes
- Irish, Iresh, Iris
- Irizarry, Irizary, Irizarie
- Irons, Iron, Erons
- Irvin, Irvine, Ervine
- Irving, Ireving Erving, Arving, Irving, Eoforwine
- Irwin, Irwine, Erwin, Irven, Irvin, Irivine
- Isbell, Isbel, Issbell, Isabel
- Isenberg, Isenburg, Issenberg
- Isham, Isom, Ishame
- Isher, Ishere, Esher
- Ishmael, Ishmeal, Ishmaele
- Islam, Islamm, Isslam
- Isler, Issler, Isller
- Isley, Issley, Isly
- Ismail, Ismaile, Ismaill
- Isaac, Issac, Isaacs
- Isaacson, Issacsen, Issacsson, Isakson, Isaksson
- Ishisa, Ishita, Stonefield
- Ishikawa, Ishikaw, Stonefield
- Ismail, Ismayil, Ismailov, Ismayilov, Ismoil, Ismoilov
- Israel, Isreal, Israele
- Issa, Isa, Issae
- Itchell, Itchel, Itchelle
- Ito, Itoe, Itow, Itou, Wisteria
- Iturburua, Iturri, Fountain, Spring
- Ivanov, Ivanoff, Ivannovs, Ivankov, Ivankovic, Ivanou, Ivanov, Ivanic, Ivanovski, Ivanow
- Ivarsson, Son of Ivar
- Ivera, Ivere, Iveras
- Ivers, Iverrs, Ivears, Ivor, Iver
- Iverson, Iversen, Iversonn
- Ivery, Ivary, Every
- Ives, Ivez, Ivis
- Ivey, Ivie, Ivy
- Ivov, Son of Ivo
- Ivory, Ivorie, Ivore
- Iwai, Cliff, Rocks
- Iwai, Base, Root
- Iwamoto, Cape, Peninsula
- Iwata, Field, Rice Paddy
- Iyer, Iyere, Iyerr, Castle
- Izaguirre, Izaguire, Izaguirr
- Izquierdo, Izquierdoe,Izquirdo
- Izumi, Spring, Fountain
- Izzo, Izo, Izzoe
