This is from Mo Sgéal Fein

Tá seana chaisleán tamall ó-dheas ó'n áit 'n-a bhfuil
an tigh, agus an Ríghtheaghlach a tugtar mar ainim air.
Rathealy a tugtar i mBéarla air, i dtreó gur
dhóich le duine gur ó dhuine éigin de mhuíntir Éalaighthe
a tugadh an ainim. Sin mar a loitean an Béarla gach
aon rud Gaedhlach go mbíon aon teangabháil aige
leis.

There is an old castle a little to the south of where the house is, and it is called the Royal Household (in Irish). It is called Rathealy in English, such that you would think that the name had been bestowed after some member of the Healy family. This is how English destroys everything Gaelic that comes into contact with it.

http://www.logainm.ie

A wealth of information.

N'fheadar an é seo an áit atá faoi chaibidil aige

http://www.logainm.ie/?text=Rathealy&listText=Rathhealy&placeID=10127

Ráth Shiail atá air, de réir an Bhráinse. Tá amhras orm faoi "Ríghtheaghlach" mar logainm.

Ní hea, a Aonghuis. Is i gCill Úird (Kilworth) atá an áit a bhí i gceist agam.