The names may not show in the Eire phone book as many
prefer to be 'ex-directory', and I have heard it said that as
many as 35% are unlisted.
The 2000 version of the UK Infodisk included the electoral rolls
but I do not have this installed as I changed each time a new
disk came out.
I may re-install if I can find room, but in the meantime try to
locate anyone in rootschat from Monaghan, perhaps they may
attend their local council electoral rolls for you.
Mike.