Having thought of a few ideas, the ones I like most are 'Synapse' and 'Compass'. The prior suggests nodes connecting to each other and hence the web, the latter implies navigation of the web. I think the prior is a more evocative, beautiful word, but the latter is easier to say and better suited for internationalisation.
Aside from that, the idea of space names is pretty good too. 'Mir' is pretty good, although people will always associate it with the former Russian space station, and 'Cosmos' is nice as well. I don't mind 'Tranquility' or 'Serenity' either, the latter will remind many of the TV series though.
Personally, I think short one-or-two syllable names work best, and that names which consist of words combined, particularly in CamelCase, feel very dated. I think any name chosen should be forward looking and represent something elegant.
I think the Haiku community should do a brainstorm to figure out some sort of sensible, coherent 'pattern' for naming the different parts of the OS. I know this may seem premature, but one of the big problems that Linux has had is that they have terrible, non-obvious, ugly names for everything, especially with the K-prefix for KDE applications, and changing names after the fact is difficult.