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Originally posted by enfield:
Hello again Brian.
I have gone through all the available placenames books( available to me) and I have never came across a single instance of Roo being the old Irish name of a rampart. These books contain the old Irish and more modern Irish and various dialects. Dyke has many variants including diog and dige but not one instance of Doo. Even the variants of Dough do not seem to agree with Fr.Tom O'Connor's article;
Dough, dabhac, sand hills.
Dough, daibhche, a caldron, vat or tub.
Dough, damh, the ox, oxen.
Dough, dough, dubh, black.
Dough, dubhach, dark or gloomy.
Dough, dumach, dumhach, dumhcha, a sand bank, sand hills.
Roe the same;
Roe, reddish brown or russet.
Roe, reó, frost.
Roe, rú, the plant ‘rue’.
Roe, rua, Ró, Reo, an Róigh/Roigh, an Róch, not given.
Roe, rua, red, or red land/place.
Roe, ruadh, ruadha, red.
Roe, ruadh, the red haired persons.
Roe, ruaidh, a red man or red haired man.
Roe, Ruaidh, Rowe, a personal or family name.

Perhaps he has access to some reference source not available to me. Does he cite his sources?
This does not mean he is incorrect it just means that I have not yet found his interpretations in any of my references.
Many thanks for the interest though. Its a great ould hobby this placenames thing.
With the greatest respect.
Tom.

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This is where I found the references to Roo and Doo: Key in "Fr.Tom O'Connor" and open "Archaeology of Turoe area (for residents) - notes by Dr.Kieran. Under Archaeology and Old Maps and then Townland Names.

I doubt if this will authenticate the views expressed but for me its another point of view.