Coola, cuaille, the pole, stake, stock or point.
Coola, cuailleach-na…, chuailleach, cúla, not given.
Coola, cúil, cúile, corner, angle, nook or recess.
Coola, chuile/chúil-an…, gCúl, not given.
Coola, cúil-an/a’/na…, corner or angle of the…
Coola, cúile, a hollow(sic).
Coola, cúl, cúile, culach, a back place, angle, corner or a recess.
Coola, cula, a hill.

Geela, geimhleach, fetters.
Geela, ghíle, water.
Geela, Ó gCaoilte, A family name.

Even the Irish Placenames Commission does not give an Irish version for it on their site.
If ever you find the Irish for it you can translate it from the wordings above.
Regards.
Tom.

When I think of "hollow", I don't usually think of a valley with a stream in it......but the dictionaries don't seem to exclude that possibility. Drumlaggagh is 197 acres, measuring about a mile north-south, and a third of a mile east-west. The townland center is a mile and a half south of the tiny town of Cloone in Co. Leitrim. The eastern and western townland boundaries are small streams and the townland is drumlin-ish in that the center rises as sort-of a ridge, about 40 or so meters above the stream elevations on either side. As of a hundred years ago, there was no road running N-S down this spine. There is now. There is a Mass Rock near the highest elevation of this ridge. Interestingly, the townland just to the NW of Drumlaggagh is named Esker. The southern edge of the Drumlaggagh is along the north end of Keelora Lough.

So I guess it's a hill ridge between the hollows, if not "of" them [gr].

I couldn't make any sense out of the URL. The highlighted link was obviously incomplete, and it just sat there - like the bump on the proverbial log. I tried to add the section after the smiley (or frowny) - and after the blank space. But that got me some sort of a "forbidden to access" message. I started chopping-off chunks of the URL, a bit at a time, all the way back to the ucd.ie part.......but nothing useful appears (except Tomcat Apache told me that I had successfully accessed some part of their site [gr]). Sorry. Nothing worked.