Translation according to P. W. Joyce:
Glennavaduoge in Galway; Gleann-na-bhfeadog, glen of the plovers : f eclipsed : p. 4, IV. Feadog, a plover, literally a whistler (fead, a whistle). See vol. i. p. 487 [reproduced below].
The plover. Feadog [faddoge], a plover; derived I suppose from fead, a whistle, from the peculiar note uttered by the bird. Feadóg generally occurs in the end of names in the forms -viddoge, -vaddoge, -faddock, etc.; as in Ballynavaddog in Meath, and Balfeddock in Louth, the townland of the plovers; Barranafaddock near Lismore, the plovers' hill-top; Moanaviddoge near Oola in Limerick, the bog of the plovers.