Translation according to P. W. Joyce:
Carrownaseer in Galway; Ceathramha-na-soar, of the builders. See Saer, vol. i. p. 224 [reproduced below].
Saer, a builder or carpenter, appears in modern names generally in the form seer; as in Rathnaseer in Limerick, the fort of the carpenters; Derrynaseer (Derry, an oak wood) the name of several townlands in Leitrim and the Ulster counties; Farranseer in Cavan and Londonderry, carpenter's land. Sometimes the s becomes t by eclipsis (page 23); as in Ballinteer, the name of a place near Dundrum in Dublin, and of a another place in Londonderry, in Irish Baile-an-tsaeri, the town of the carpenter or builder. The ancient Celtic nations navigated their seas and lakes in the curragh or hide-covered wicker boat; and it is very probable that it was in fleets of these the Irish mader their frequent descents on the coasts of Britain and Gaul. Canoes hollowed out of a single tree were also in extensive use in Ireland, especially on the rivers and lakes, and they are now frequently found buried in lakes and dried-up lake beds.