Lucydlac

'Lucy', the female name, comes from 'luce', 'lux', that is, light (and Lucia being also the name of Joyce's daughter). The image here, the shining lake in a high valley, evokes the hermit's hands enclosing the stream water, reinforcing the imagery of the masculine mountain (Finn-HCE turned into one some chapters ago) with the feminine water-lake-river.

Of course, it could be read also as 'lucid lake' (lac is Fr)