| Gason | Ir. Ó Gusáin, gus = strength. The name does not appear in current telephone directories, but has been previously recorded. See Gaussen. |
| Gaussen | Ir. Ó Gusáin. A branch of Síol Muireadhaigh in Roscommon. The name does not appear in current telephone directories, but has been previously recorded. See Gosson. |
| Gosson | rare: Mayo. Ir. Ó Gusáin, gus = vigour. A family of Síol Muireadhaigh in Connacht, there is synonym: Gasson. There is also an English name of this form. |
| Ó Gusáin | Gosson: annamh: Maigh Eo. Dúirt Mac Firbhisigh gur craobh de chuid Síol Muireadhaigh iad. Brí: gus = fuinneamh. SGG. |
Parishes where Gason and a second surname are found together
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