Translation according to P. W. Joyce:
Lisheenakeeran in Galway ; Lisin-a'-chaorthainn, of the quicken-tree. See vol. i. p. 513 [reproduced below].
The quicken-tree. Caerthainn [keeran or caurhan], is the Irish word for the quicken-tree, mountain ash, or rowan-tree. It enters into names very often in the form of Keeran, which is the name of several townlands; but it undergoes many other modifications, such as Keerhan in Louth; Carhan in Kerry, as in case of the river Carhan (quicken-tree river) at Cahersiveen; Kerane and Keraun in Tipperary and King's County: - all these places must have produced this tree in abundance, for the names mean simply mountain ash. Drumkeeran, the ridge of the quicken-tree, is the name of a village in Leitrim, of a parish in Fermanagh, and of several townlands in the northern counties.