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| Johnson | numerous: all areas: English & Scottish; also anglicisation of Mac Seáin (MacShane) who were a branch of the O'Neills. |
| MacShane | numerous: Ulster generally, Louth-Meath etc. Ir. Mac Seáin, the first name Seán is a gaelicisation of Norman-French Jean. A branch of the O'Neills of Tyrone. SI. |
Parishes where a Johnson and a second surname married each other.
This list shows total Johnson Roman Catholic marriages by county.
Click on the county to see detail.