It's already written in Irish.
Surname or personal name?
shannon
They would be the same as in English.
The name would be equated with Aodh (as is Hugh).
as Gaeilge
The Irish language Bible gives Miriám as Miriam.
In the Irish language: Ó Duibhir
Rinne mé.
Seán
fírinne
SibealÉilís
cúig