- Judge
- Judges
- Judkins
- Juggins
- Juillard
- Julians
- Juniper
- Jupp
- Jury
- Juteau
- Jutson
- Jutten
- Mary (between 1824 and 1825 - )
- Jutton
- Juttus
- Juza
- Kaberry
- Kaehne
- Kaltenbach
- Kane
- Kangas
- Kapple
- Karren
- Katesmark
- Kaufmann
- Kavanagh
- Kay
- Kay-Shuttleworth
- Kaye
- Kayser
- Kealey
- Kean
- Keane
- Kearn
- Kearsley
- Keast
- Keat
- Keate
- Keates
- Keatley
- Keeble
- Keefe
- Keeler
- Keeley
- Keeling
- Keen
- Keene
- Keep
- Keevil
- Keft
- Kehler
- Keidel
- Keighrey
- Keil
- Keirle
- Keith
- Kelf
- Kellaway
- Keller
- Kelley
- Kelly
- Kelsey
- Kelt
- Kelton
- Kember
- Kemmett
- Kemp
- Kempson
- Kempster
- Kench
- Kendall