- Nathan Kogan to Gregory Koger
- Harold Koger to Richard Kogler
- Robert Kogler to Esther Koh
- Eugene Koh to Jean Kohan
- Jeffrey Kohan to Cassandra Kohl
- Catherine Kohl to Kimberly Kohl
- Klaus Kohl to Virginia Kohl
- Wallace Kohl to Cindy Kohler
- Claire Kohler to Josephine Kohler
- Josh Kohler to Robert Kohler
- Roberta Kohler to Frank Kohlhofer
- Michael Kohlhofer to John Kohlman
- Joseph Kohlman to Carl Kohls
- Carol Kohls to Betty Kohn
- Beverly Kohn to June Kohn
- Justin Kohn to Tara Kohn
- Taylor Kohn to Tina Kohnke
- Victoria Kohnke to Megan Kohr
- Melanie Kohr to Julie Kohut
- Karen Kohut to Ryan Koivisto
- Victor Koivisto to Kiran Koka
- Mohan Koka to John Kokkinos
- Michael Kokkinos to James Kolacz
- Jennifer Kolacz to Agnes Kolar
- Alan Kolar to Sandra Kolar
- Sara Kolar to John Kolasky
- Paul Kolasky to Erin Kolb
- Ernest Kolb to Max Kolb
- Maxine Kolb to Eric Kolbe
- Erin Kolbe to Frank Kolberg
- Gary Kolberg to Frank Kole
- Gary Kole to Sharon Kolenda
- Stanley Kolenda to David Koleski
- Edward Koleski to Harry Kolinski
- Helen Kolinski to Joel Kolko
- Miriam Kolko to Justin Kollar
- Karen Kollar to Beverly Koller
- Bill Koller to Louis Koller
- Louise Koller to Oretha Kollie
- Richard Kollie to Lori Kollmann
- Louise Kollmann to Stephen Kolnik
- Anthony Kolo to Michelle Kolodziej
- Mike Kolodziej to Brian Kolp
- Bruce Kolp to Susan Kolstad
- Terry Kolstad to John Komada
- Joseph Komada to Walter Komarnicki
- Kevin Komarniski to Richard Komm
- William Komm to John Kompare
- Joseph Kompare to Seydou Konate
- Souleymane Konate to Junko Kondo
- Kaoru Kondo to Naveen Konduru
- Rajendra Konduru to Martin Konefal
- Mary Konefal to Andy Kong
- Angel Kong to Jack Kong
- Jackie Kong to Patrick Kong
- Paul Kong to Yau Kong
- Ye Kong to Jason Konieczny
- Jeffrey Konieczny to Karen Koning
- Kathleen Koning to Ralph Konkel
- Raymond Konkel to George Konkus
- John Konkus to Matthew Konopa
- Michael Konopa to Rose Konopka
- Rosemary Konopka to Kristine Konrad
- Kurt Konrad to John Konstanzer
- George Konstas to William Konya
- John Konyak to Edith Koo
- Edward Koo to Yoon Koo
- Youn Koo to Nicole Kooiker
- Paul Kooiker to John Kooman
- John Koomen to Joshua Koon
- Joyce Koon to Anna Koonce
- Anne Koonce to Kay Koonce
- Keith Koonce to Allison Koons
- Amanda Koons to Lisa Koons
- Lloyd Koons to Carey Koontz
- Carl Koontz to Joy Koontz
- Joyce Koontz to Tasha Koontz
- Taylor Koontz to Ronald Koop
- Rose Koop to Stephanie Koopman
- Stephen Koopman to Elizabeth Kooy
- James Kooy to Scott Kopacz
- Sharon Kopacz to Ronald Kopczynski
- Sara Kopczynski to Suzanne Kopec
- Ted Kopec to Michael Kopel
- Paul Kopel to Donald Kopf
- Donna Kopf to Amanda Kopinski
- Barbara Kopinski to Joanne Koplin
- John Koplin to Donna Kopp
- Donnie Kopp to Marguerite Kopp
- Maria Kopp to Christopher Koppe
- David Koppe to Doris Koppenhaver
- Frank Koppenhaver to John Koppy
- Joseph Koppy to Thomas Kor
- William Kor to Mary Koranek
- Michael Koranek to Joseph Korba
- Karen Korba to Anthony Korda
- Daniel Korda to Abraham Koren
- Adi Koren to Brandon Korf
- Brenda Korf to Paul Korinek
- Rebecca Korinek to Lois Korman
- Marc Korman to Doris Korn
- Dorothy Korn to Sally Korn
- Sam Korn to Alan Kornbluth
- Brett Kornbluth to Larry Kornegay
- Laura Kornegay to Christopher Kornfeld
- Daniel Kornfeld to Igor Korolev
- Mikhail Korolev to Thomas Korosec
- William Korosec to Walter Korsak
- Elena Korsakova to Albert Korte
- Alexander Korte to Monica Korte
- Nancy Korte to Kathryn Korth
- Kathy Korth to Robert Kortus
- Thomas Kortus to Carl Korzkowski
- William Korzon to Chester Kosakowski
- Christine Kosakowski to Gerald Kosch
- James Kosch to Daniel Kosecki
- James Kosecki to Robert Koser
- Roger Koser to Christina Kosiba
- Christine Kosiba to Mark Kosin
- Michael Kosin to Nancy Kosior
- Patricia Kosior to Charles Koski
- Charlotte Koski to Norman Koski
- Oliver Koski to Charles Kosky
- Cheryl Kosky to Gail Koslowski
- Gary Koslowski to James Kosmides
- Michael Kosmides to Catherine Koss
- Cathy Koss to Robin Koss
- Roger Koss to Albert Kossuth
- Charles Kossuth to Stanley Kost
- Stephanie Kost to Laura Kostecki
- Linda Kostecki to Mary Kostenbader
- Robert Kostenbader to Johanna Koster
- John Koster to Norbert Kosterman
- Paul Kosterman to Jane Kostka
- Janice Kostka to Henry Kostrzewa
- James Kostrzewa to Eva Kot
- Francis Kot to Lorraine Kotarski
- Margaret Kotarski to Lisa Kotecki
- Mark Kotecki to William Koth
- Ajay Kotha to Sandra Kothe
- Steven Kothe to Alexander Kotlyar
- Alla Kotlyar to Donald Kotrba
- James Kotrba to Daniel Kotter
- David Kotter to Randy Kottwitz
- Richard Kottwitz to Samuel Kotz
- Sandra Kotz to Stanley Kouba
- Stephen Kouba to James Kouma
- Mary Kouma to Mary Kouri
- Matthew Kouri to Jerry Koutavas
- Robert Koutek to Joanne Kovac
- Joe Kovac to Agnes Kovach
- Akos Kovach to Joyce Kovach
- Judith Kovach to Edward Kovachy
- Vehbi Kovaci to Benjamin Kovacs
- Bernard Kovacs to Kim Kovacs
- Kimberly Kovacs to Aleksandr Koval
- Aleksey Koval to Pauline Koval
- Pavel Koval to Peter Kovalcik
- Richard Kovalcik to Carol Kovalik
- Charles Kovalik to Johnny Kovar
- Joseph Kovar to Stephen Kovarik
- Steven Kovarik to Karen Kovich
- Katherine Kovich to Jonathan Kowal
- Joseph Kowal to Paul Kowalchyk
- Edward Kowalcik to Kimberly Kowalczyk
- Kris Kowalczyk to Henry Kowaleski
- James Kowaleski to Nicholas Kowalewski
- Nicole Kowalewski to David Kowalkowski
- Edward Kowalkowski to Cheryl Kowalski
- Chester Kowalski to Jolanta Kowalski
- Jon Kowalski to Rene Kowalski
- Renee Kowalski to Mary Kowalsky
- Maryann Kowalsky to Kumiko Koyama
- Makoto Koyama to Anne Kozak
- Annie Kozak to Lisa Kozak
- Lois Kozak to James Kozan
- John Kozan to Peter Kozel
- Rebecca Kozel to Michele Kozicki
- Patricia Kozicki to Mark Kozina
- Mary Kozina to Pawel Koziol
- Peter Koziol to Maksim Kozlov
- Maxim Kozlov to Diana Kozlowski
- Diane Kozlowski to Margaret Kozlowski
- Maria Kozlowski to Ethel Kozma
- Frank Kozma to Robert Kozul
- Anthony Kozumplik to Sandra Krabbe
- Susan Krabbe to David Kracke
- Donald Kracke to Elaine Kraemer
- Eleanor Kraemer to Patrick Kraemer
- Paul Kraemer to Joseph Krafka
- Michael Krafka to Dorothy Kraft
- Doug Kraft to Kate Kraft
- Katharina Kraft to Randal Kraft
- Randall Kraft to Jonathan Kragel
- Mark Kragel to Thomas Krahling
- Timothy Krahling to James Krahulec
- John Krahulec to Erik Krajewski
- Erin Krajewski to Richard Krajnik
- Sean Krajnik to Stanley Krakowski
- Stephen Krakowski to Louis Kralevich
- John Kraley to Howard Krall
- Irene Krall to James Kram
- Janet Kram to Aron Kramer
- Arthur Kramer to Crystal Kramer
- Curt Kramer to Georgia Kramer
- Gerald Kramer to Julie Kramer
- Julius Kramer to Marcella Kramer
- Marci Kramer to Reva Kramer
- Rex Kramer to Trudy Kramer
- Twila Kramer to Frank Kramp
- George Kramp to Kevin Kranich
- Kyle Kranich to Denise Krantz
- Dennis Krantz to Peter Krantz
- Philip Krantz to Frank Kranz
- Fred Kranz to Tyler Kranz
- Valerie Kranz to Robert Krasin