- Kaba
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- Kajiyama
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- Kalajian
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- Kalinichenko
- Kalinowski
- Kallan
- Kallasorg
- Kalmenson
- Kalpakchian
- Kambara
- Kamei
- Kamen
- Kaminik
- Kaminski
- Kamisher
- Kamiya
- Kamjoo
- Kamkar
- Kampe
- Kandel
- Kane
- Kaner
- Kaneshiro
- Kang
- Kao
- Kapadia
- Kaping
- Kaplan
- Kapp
- Kappel
- Karadavoukian
- Karagianis
- Karaiakoubian
- Karamanukyan
- Karapetian
- Karapetyan
- Karasik
- Karayan
- Karim
- Karlinsky
- Karmatz
- Karney
- Karp
- Karpman
- Kasabian
- Kasabyan
- Kashar
- Kasliwal
- Kasper
- Kass
- Kassirer
- Kasson
- Katchen
- Katich
- Kato
- Kattler
- Katz
- Kauffman
- Kaufman
- Kavanagh
- Kawakami
- Kawamoto
- Kawaye
- Kay
- Kaye
- Kazakos
- Kazanchyan
- Kazandjian
- Keagy
- Kechris
- Keefe
- Keely
- Keeshen
- Keever
- Keffer
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- Kehr
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- Keith
- Kelch
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- Keller
- Kelley
- Kellough
- Kellum
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- Kelsey
- Kelso
- Keltie
- Kempster
- Kendall
- Kendrick
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- Kennedy
- Kent
- Kenyon
- Keolian
- Kern
- Kerr
- Keserica
- Keshishian
- Keshishyan
- Kester
- Keurjikian
- Kevan
- Key
- Keys
- Khacherian
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- Khalili
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- Khaykin
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- Khoshbin
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- Kiele
- Kienzle
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- Kleinman
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- Kwan
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- Kwong
- Kyles