lurveng isn't a canonical tlhIngan Hol name, as far as I know. I think 'made up' names such as this shouldn't be used in Duolingo. If they are made up of real tlhIngan Hol words (lur + veng), that could also confuse the user (pupil city?)
I can see an argument for using names that aren't tied to canonical characters. I'm curious about where "lurveng" came from, though; did someone just make up a name they thought sounded plausible?
I believe so.