I agree that preliminary research reports should be corrected so that alien names are better explained.
The same way "Taman" is explained as being a corruption of a local naming in the introduction text, "Ortnok" and "Shevaar" should be introduced by a way or another in their respective preliminary (not completed) research report.
Taman are mute (except when they are hurt). But "Ortnok" could simply come from the perceived sound they occasionally emit: kind of a crude, mumbled "Ort-Nock". Perhaps, this mumbling could be occasionally played whenever Ortnoks are near.
In the same idea, "Shevaar" could comes from a hissing warcry they occasionally emit when they deal a deathblow with a melee weapon: "Shhh'vaar". Both of these sounds would be the ones that would haunt the survivors of the first encounters, after all (along with the hissing of charged plasma bolts).
Remember too that the Kerr Blade was named (by troopers) from the sound it makes when shredding through human cloth and tissues.
Also, "Bloodspider" is obviously the kind of surname soldiers would have put on these strange, and yet familiar looking robots.
Preliminary research report should introduce this name too: "Based on its general form and the way it spills gore, our men named it "Bloody Spider" or "Bloodspider" or simply "Spider", whereas any biologist would agrees that the form is not that of a true arachnoid."
Imo, "Hovernet" stands for "Hovering Hornet", based on the buzzing sound it emits when hovering, and on "hovercraft", again according to the first troopers who encountered this robot.
By the way, it's pretty the same with the naming of the UFOs, except that this time, the surname comes from the pilots and the air commanders (we thought they were Fighter and Bomber crafts because of their lethality in the sky, and after due analysis they are mere armed scouts and assault barges).