Well, I am tracing the old slíte of Ireland and am at present reading A Road on the Long Ridge by Hermann Geissal (2006). In one of his footnotes he mentions that a local historian in Edenderry always thought that Ceis na bhainne meant the wicker causeway of the milk(maids). She now thinks it means Cois na hAbhaine - Near the river. However, in the same footnote another historian feels that it means Ceis (n)a mhainigh - The causeway of the monks (on their way to and from Clonard/Clonmacnoise. Isn't the meaning of placename a wonderful hobby!