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- Jablonski, Jablonskie, Jablonsky
- Jack, Jac, Jake
- Jackson, Jacson, Jacksons, Jaxon
- Jackman, Jackmann, Jackmen, Jakeman, Servant of Jack
- Jacobs Jacobb, Jacobes Jacob, Jacobse, Jacobo, Jacoby, Jakab
- Jacobsen, Jacobson, Jacobsson, Jakobsen, Jakobsson
- Jacoby, Jacobi, Jacobie, Jakobi, Jakoby
- Jacques, Jacque, Jaquez, Jacquet
- Jafari, Jafar, Jaffar
- Jaeger, Jager, Jagger, Gager, Gagger
- Jagoda, Berry, Bury
- Jahn, Johannes, Johanness, Johanessen, Johann, Johan, Johansson
- Jain, Jaine Jains Jane, Janes
- James, Jamies, Jamesis, Jaimes, Jaime
- Jamison, Jameson, Jammison, Jemison, Jameyson, Jamieson, Jimmison, Jemson
- Jamshidi, Jamshid
- Janda, Jan, Janicek, Jans, Jandacek, Jankovic, Jankauskas, Janko, Janos, Jankowski, Janowski, Janz
- Jang, Jange, Yang
- Jank, Janke, Janks
- Jankowski, Jankowsky, Jankowskey
- Janney, Janey, Janie
- Janota, Sleek in Portugal
- Jansen, Janson, Jansonn, Jan, Jansing, Jansingh, Jannsens, Janz, Janzen
- Janvier, January
- Jaquette, Jacquet, Jaquett
- Jara, Jarra, Jarre
- Jaramillo, Jaramago Tree, South of Castilla Spain
- Jarine, Garden, Gardener
- Jarratt, Garred, Jared, Jarrett, Garrett, Jarretts
- Jarrell, Jarrall, Jerrell
- Jarvi, Jarvinen, Lake
- Jarvis, Jarvus, Jervis, Gervais
- Jarnot, Jarnott, Jarnoe
- Jaskolski Jaskolki, Jaskolka, Jaskulski
- Jasper, Jaspers. Jaspper
- Jasso, Jassoe, Jassio, Jaso
- Jaunich, Jaunick, Janiche
- Jauregui, Jaureguia, Jaregui
- Javier, Javer, Javere
- Jay, Jaye, Jaie
- Jean, Jeane, Gene, Jeanes, Genoa
- Jeanbaptiste, Jeanbaptist, Jeanbaptists
- Jeansonne, Jeansonn, Gennison
- Jedlicka, Jedle, Firtree
- Jedynak, Only Child, Jedynk
- Jeffcoat, Jefcoat, Jeffcoatt
- Jefferson, Jeffeson, Jeffson, Jefson, Jepherson
- Jeffery, Jeffry, Jeffers, Jeffries, Jeffrey, Jeffry
- Jeffords, Jefords, Jefferds, Jeffards
- Jehlicka, Jehla, Needle
- Jekyll, Judicael, Jekyl
- Jelen, Stag, Jellen, Jelinek
- Jenkins, Jinkins, Jen, John
- Jenks, Jenckes, Jencks
- Jenner, Jener, Janner, Janna
- Jennings, Jenings, Jennens, Jennys
- Jennison, Jenison, Jennerson
- Jensen, Jenson, Jenssen, Jens
- Jeong, Zheng, Jheong
- Jephson, Jepson, Jeppe, Jeppesen, Jep
- Jerkovic, Jerko, Son of Jerko
- Jeremiah, Jeremiahe, Jeremiahs
- Jernian, Jarnagan, Jonakin, Journican
- Jernigan, Jerrnigan, Jernigen
- Jerome, Jerom, Jeromes
- Jeronimo, Sacred Name
- Jerry, Jary, Jarry
- Jesper, Jepersen, Jesperson
- Jessing, Jessy, Jessinge
- Jessup, Jessip, Jesup
- Jester, Jestre, Jesters
- Jeter, Jetter, Jettere
- Jett, Jet, Jetts
- Juene, Juen, June
- Jewell, Jewel, Jewelle, Judicael
- Jewett, Jewet, Jewette
- Jez, Hedgehog, Jezz, Jezek
- Jiang, Jiange, Giang, Ginger
- Jimenez, Jim, James, Son of James, Jimeno
- Jin, Jinn, Gold
- Jinks, Jenks, Son of Jenk, Jen, John
- Jo, Cho, Good, Joo, Joosens, Son of Joos
- Joaquim, Granted by The Almighty
- Job, Jobe, Jobb
- Joffrion, Jofrion, Jopherin
- Johnson, Jonson, Johnston, Johnstone, Johanson, Johnsen, Jonsen, Jonston Johansen, Johnsson, Jonsson
- Johns, John, Jones
- Joines, Joynes, Joins
- Joiner, Joyner, Joyners
- Joivette, Joyvette, Joivete
- Jokela, Jokinen, Joki, River
- Jokumsen, Son of Jokum, Jokumson
- Jollenbeck, Jollebeck, Small Stream
- Jolly, Jollie, Jolley, Jolie, Joly, Joli
- Jonas, Jona, Jonis, Jonaitis, Jonasson, Jonasen
- Jonckers, Jonker, Jonkers, Jonkheer, Nobleman, Jonkheers
- Jones, Jonnes, Joness
- Joosten, Joost, Jooston
- Joplin, Jopling, Jopplin
- Joppa, Jopp, Jopa, Jopps
- Jordan, Jaudan, Jaudon, Jordain, Jorden, Jordin, Jordon, Jourdan, Jurden, Jurdon, Yerdon
- Jorgensen, Jorgenson, Jourgensen
- Joseph, Josephe, Josephs, Josephson
- Joshi, Josh, Joshie, Jyotisha
- Joubert, Gaubert, Jobert
- Jovan, Jovanovic, Jovanovski
- Joy, Joie, Joye
- Joyner, Joynar, Joynor, Joiner
- Joyce, Joyse, Joice
- Juan, Juann, Juane
- Juarez, Suarez, Son of Suero
- Jubril, Jubrill, Jubbrill
- Jude, Jud, Judd
- Judge, Judges, Juge
- Judice, Justice, Judge
- Judson, Juddson, Judison, Judsonn, Jutson, Juttson
- Jugovac, Jug, Jugo, South
- Juhasz, Juh, Shepherd
- Jukic, Jur, Juraj
- Julian, Juelian, Jullian, Julien
- Jundt, Jud, Judith
- Jung, Junc, Jeong, Junge
- Jump, Jumpp, Jumpe
- June, Junne, Jun
- Juneau, Juno, Junno, Junneau
- Jung, Yung, Junge
- Jump, Jumpp, Jumpe
- Juric, Jure, Jurisa, Son of Josip
- Justice, Justiss, Justis, Justus, Justice
