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- Kalb, De Kalb, Calb
- Kamerer, Kemmerer, Kammeron, Cammerer, Kaemmerer,
- Karmany, Carmany, Karmenie
- Karriker, Kariker, Carriker
- Katz, Kats, Kattes, Katts, Kautz
- Kaufman, Caughman, Coffman, Coughman, Kauffman, Kofman
- Kaup, Caup, Kaub
- Kaur, Princess, Sikh Princess
- Kay, Kaye, Kaie
- Kearney, Keerney, Kerney
- Keator, Keater, Keeter
- Kee, Key, Keye, Kees, Keys
- Keedy, Keedys, Keady
- Keefer, Keever, Keifer, Kiefer, Kieffer
- Keeler, Keelor, Keiler, Kieler
- Keeley, Keely Kiehley
- Keeling, Kealing, Keiling
- Keener, Keemer, Kemer, Keaner
- Keen, Kean, Keene
- Keenon, Keynon, Keenan
- Keep, Kepe, Keap
- Keeper, Keiper, Keaper
- Keeports, Keeport, Keyport
- Keesee, Keese, Kease
- Keeting, Keating, Keetin
- Keezer, Keazer, Keaser
- Kefauver, Keafaufer, Kephafer, Keefhover
- Keffer, Keefer, Keaffer
- Kehler, Keller, Keiller
- Keibeard, Keeberd, Kebert
- Keigher, Kigger, Kyger
- Keigwin, Keiwin, Kygwin
- Keillor, Keilor, Keillar
- Keim, Kime, Kiem
- Keiser, Keisar, Kieser
- Keisly, Keisley, Kesley
- Keith, Keath, Keeth
- Keiter, Keither, Kiter
- Kelder, Kelter, Keldter
- Keller, Kellar, Keler
- Kelsey, Kelcey, Kelsay, Kilcey, Kilsey, Kitsey
- Kelly, Kelley, Killy
- Kelso, Kelsey, Kelsy, Kelsa, Kellsay, Kelsea, Callsay, Kelsi, Kelsay, Cellsey
- Kemp, Kamp, Kempf
- Kemper, Kampfer, Camper
- Kendrick, Kenrick, Kindrick, Kindreck, Kinrick, Kendig
- Kendall, Kendal, Kendle, Kendoll, Kindle
- Kenestrick, Kenstrick, Kenestick
- Kennard, Kinard, Kinneard
- Kennedy, Canada, Canaday, Canady, Cannada, Cannaday, Kanada, Kanaday, Kenedy, Kenneday
- Kennsington, Kennsinton, Kennsingston
- Kent, Kentt, Keint
- Kerley, Kerly, Kirley
- Kerlin, Kirlin, Kirling
- Kern, Kerns, Carnes Cairns, Kernes
- Keogh, Keoghe, Keugh
- Kerr, Carr, Karr, Kehr, Kurr
- Kersey, Kersy, Kersee
- Kesterson, Kestrson, Kestersonn
- Ketelas, Kettelas, Kettela
- Kettner, Ketner, Kidner, Kilner, Kitner
- Keyser, Keiser, Kiser, Kizer, Kyser, Kysor, Cizer
- Khan, Chief, Ruler
- Kibbe, Keby, Kibbey, Kibby
- Kidder, Kidders, Kidderer, Kitter
- Kiester, Keister, Kister
- Kilbourn, Kilborn, Kilburn
- Kilby, Killby, Kelby
- Kilgore, Killgore, Killgor
- Kilham, Killham, Killam, Killim, Killan, Kellham, Kellam, Kellan
- Killbuck, Kilbuck, Killbick
- Kilmer, Kulmer, Kilmner
- Kilts, Kills, Kiltz
- Kim, Kime, Keim, Gold
- Kimball, Kimbal, Kimbell, Kimble, Cimbal, Cimball, Kemble
- Kimpton, Kimton, Kinton
- Kind, Kinde, Kinds
- King, Kinge, Koenig, Konig, Kung, Kings
- Kingery, Kingree, Kingrey
- Kingsbury, Kingsberry, Kingsbery
- Kingston, Kington, Kinson
- Kinney, Kinny, Kenney, Kenny, Kinnie, Keeney, McKinney, Kenne, McKenna
- Kinsman, Kinnsman, Kinsmen
- Kipp, Kipps, Kip
- Kipton, Kippton, Kiptin
- Kirby, Kerby, Kerbey, Cirby
- Kirk, Kirke, Kirks
- Kirkman, Kirkmen, Kirkeman
- Kirkner, Kirknar, Kirknor
- Kiser, Kyser, Keiser, Kisers
- Kiskadden, Kiskaden, Kiskadin
- Kister, Kester, Kesster
- Kistler, Kister, Cistler
- Kistner, Kister, Kisner, Kissner
- Kitchen, Kittchen, Citchen
- Kitt, Kit, Gitt
- Kitzmiller, Kittzmiller, Kitsmiller
- Klaus, Klauss, Claus
- Klauser, Klauser, Clauser
- Kleber, Cleaver, Clever, Klippart
- Kline, Cline, Klein
- Klinefelter, Kleinfelter, Klinfelter
- Klinger, Clinger, Klinker
- Klunk, Klunck, Clunk
- Knapp, Napp, Nap, Knopp, Knabb, Knap
- Kneisley, Knisley, Nicely, Nisly
- Knepper, Neeper, Knebber
- Knickerbocker, Knickerbacker, Knicherbocker
- Knight, Knights, Knighte, Knecht, Night
- Knighton, Knightin, Nighton
- Kniskern, Knisker, Niskern
- Knittle, Gnittel, Knittel, Nittel, Nittle
- Knorr, Knor, Knorre, Norre
- Knott, Knotts, Nott
- Knowles, Knowls, Knoules
- Knox, Knotts, Knocks, Nox, Knott, Nock
- Koch, Kock, Kough, Cogh
- Koger, Coger, Cogger
- Kohler, Kaler, Kayler, Koller
- Kolb, Culp, Kulp
- Konig, Kung, King
- Kopft, Kopht, Koft
- Koser, Kooser, Kuser
- Kouba, Koaba, Konba, Kuba
- Kramer, Kreamer, Ramer, Krammer, Crammer, Cramer
- Kreidelbach, Cradlebaugh, Kridelback
- Kreps, Cribbs, Grape Greb, Gripe, Kreb, Krape, Krebs, Kribbs
- Kress, Cress, Cresse, Gress, Kress, Kriss
- Krichbaum, Kreighbaum, Crichbaum
- Krohn, Crone, Krone
- Krom, Crumb, Crume, Crumm, Krom, Krum, Krumm
- Krog, Kroge, Krogge, Kroug
- Krueger, Kruog, Krug
- Kugler, Koogler, Coogler
- Kuntz, Coens, Coons, Kantz, Kiehn, Koons, Kuehn, Kuhn, Kuhns Kunz
- Kurtz, Curts, Kirts, Kirtz, Kurts
