If this name is Greek, the forepart of it might have derived from the Greek element pertho, meaning "to sack, to destroy." And according to Carl Daling Buck in his Comparative Grammar of Greek and Latin, the -eus suffix found in so many Greek names is typically used to form an agent noun. So, this could mean that Perseus was a "destroyer" by profession, i.e. a "soldier," which is a fitting name for this legendary hero.