|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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