- Jackson
- Jacobius
- Jacobs
- Jacobsen
- Jacops
- Jaeger
- Jaekel
- Jagger
- Jakubowski
- Jakush
- Jalbert
- James
- Jamison
- Janezic
- Janik
- Jansen
- Janson
- Janzen
- Jaramillo
- Jarasitis
- Jarboe
- Jared
- Jarles
- Jarrell
- Javanbakhtsani
- Javed
- Jedlicka
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- Jehn
- Jend
- Jenkins
- Jennings
- Jensen
- Jepsen
- Jerman
- Jersin
- Jesse
- Jessen
- Jewell
- Jewett
- Jimenez
- Jiminez
- Jindrich
- Jiner
- Jiron
- Jobe
- Jobin
- Jochem
- Jodkowski
- Johanknecht
- Johanning
- John
- Johns
- Johnson
- Johnsondaniel
- Johnston
- Jolas
- Jonas
- Jones
- Joosten
- Joransen
- Jordan
- Jorgensen
- Jost
- Joy
- Joyce
- Judd
- Judson
- Juett
- Juhl
- Jupp
- Jurgensen