- Kingsbury (continued)
- Kingsley
- Kingston
- Kinkade
- Kinker
- Kinlin
- Kinnbel
- Kinne
- Kinney
- Kinnie
- Kinsman
- Kintz
- Kirby
- Kirchhofer
- Kirchoff
- Kirk
- Kirkegaard
- Kirkhan
- Kirkland
- Kirkpatrick
- Kirsch
- Kirtland
- Kishigo
- Kissel
- Kitchell
- Kitchen
- Kitchenmaster
- Kitko
- Kittle
- Kittredge
- Kizer
- Klaiman
- Klamm
- Klappal
- Klass
- Klein
- Kleinschmidt
- Klement
- Kleppe
- Kline
- Klitsche
- Klocko
- Kloepfer
- Klose
- Klunker
- Knapp