"Orava" is often taken on various sites (it means squirrel in Finnish), so I started using other nicks like 0rava/Qrava/borava/whateverava, all of which ended in "rava", so it was kind of like my nickname suffix, -rava, which became dashrava for SEO purposes.
It's a generic naming convention I use for guns of the same type that have real-life counterparts (can't use the real names due to boring legal stuff.) Basically it's a bit more interesting than "Assault Rifle 2", and a bit more informative since the letter matches its counterpart (e.g. G=Galil iirc.)
 "Mutilate-a-Doll 2"){kind=icon}
 "Don't Escape 2"){kind=icon}
See FAQ.