Hope I'm doing this correctly. pugnax is also a type of shorebird, the ruff and also a type of sandcrab (maybe there's some maritime connection?). So, I wouldn't go too crazy with the pug coming about a la pugilist; that word also signifies footprint from the indo-european, and is a verb for the action of mixing mortar or clay to make the substance pliable. (pugging or pugged the actions, pug the result). I don't know where in the wiki this is going but I may have put the above info in squidwiggle's page and I apologise for the intrusion.