...Zangger identifies the “Ekwesh” or “Aqaiwasha” with the Achaeans... and the “Denyen” with the Danaoi... alternate names for the Hellenes familiar from Homer, with the further suggestion that the term “Achaeans” derives from a hypothesized ancient Pelasgian word “*acha”, which would mean water. This theory implies that the Philistines were part of this Greek-speaking confederacy.
http://www.halfvalue.com/wiki.jsp?topic=Sea_Peoples