From Harpokration s.v., where the second name is transmitted as Polyalkes -- surely correctly, despite being also in Photius s.v. and again in the Suda at pi 1938.
The C19 editor of Harpokration, L.Dindorf, suggested that these are the individuals, so named, mentioned in Lysias 18.13 and Isocrates, Letters 6.1, respectively. Perhaps, therefore, the apparent conjunction of them is illusory; in Harpokration (if not here in the Suda) they would have been adjacent alphabetical entries.