I always think of arcen as Arsen.. which gives me several giggles none of which are rated teen ;p Mainly because of the German meaning of Arsen ->
http://de.wikipedia.org/wiki/Arsen Neinzul .. well i only call it n'zul , as that seems to be a legitimate way to shorten the nein in this case ;p And it reminds me of WoW..... which i swore never again to touch, ever.!
As for Zenith
Theres in german Zenit + Remnant = Zenit Remnant !
Also think x4000 needs to cut down on the LSD when naming stuff though, as all these names, including AI War, are completely incompatible with a casual talk between 2 people ! ;P
Mainly because of AI which sounds like EI .. Ei-Waghhh , sounds like orkish! (the Wh40k kind)