| Surname | Forename(s) | Town | Occupation | Date | Ref. No. | |
|---|
 | Jacks |
| |
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|  |
| Jacob |
| |
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| Jacson |
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| Jagger |
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| Jane |
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| Jankyn |
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| Jardine |
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| Jarman |
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| Jarvis |
| |
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| Jebb |
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| Jeece |
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| Jeffery |
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| Jefferys |
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| Jeffreys |
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| Jeninges |
| |
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| Jenkins |
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| Jenks |
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| Jenninges |
| |
|
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| Jennyngs |
| |
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| Jenour |
| |
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| Jephson |
| |
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| Jesper |
| |
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| Jessop |
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| Jevons |
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| Jodrell |
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| John |
| |
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| Johns |
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| Johnstone |
| |
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| Jolliffe |
| |
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|
|
| Ap David Ap Ithell Lloyd |
| |
|
|
| |
|
|
 | Ap Gruffud |
| |
| | CYMO | | 1398 | DD/WY/283 | |
|
|
| Ap Gruffud Ap Ieuaf |
| |
|
|
| |
|
|
| Ap Ieuan Ap Llewelyn |
| |
|
|
| Ap Ieuan Ap Llewelyn Ap M' |
| |
|
|
| Ap Jankyn Ap Ieuan |
| |
|
|
| |
| Jonas |
| |
|
| |
| Jones |
| |
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| Jones-Mortimer |
| |
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| Jones-Roberts |
| |
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| Jones Alias Evans |
| |
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| Jones Bateman |
| |
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| Jones Griffiths |
| |
|
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| Jones Morris |
| |
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| Jones Parry |
| |
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| Jones (Alias Edwards) |
| |
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| Jones (Alias Shone) |
| |
|
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| Jones, Bulkeley O |
| |
|
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| Jones, Winifred Otherwise Richards |
| |
| Jones, (Formerly Burdett) |
| |
| Jones. |
| |
|
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| Jonett |
| |
|
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| Joseph |
| |
|
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| Jowett |
| |
|
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| Joyce |
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| Judge |
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| Jury |
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