1. Don't like it. Confusing and just wouldn't feel like I was truely apart of the department if someone else had the name. Just not strict enough to be omni-tek
2. This would be my choice. Guilds should be something totally different from the companies and departments of omni-tek. No names should be allowed that even resemble the departments.
Everyone that works for omni-tek should be apart of some department... Guilds should not be treated as departments of their own, but more like factions within the companies... or a collection of people from companies that come together for a purpose.
3. Hate it. Just hate it. Would cause more harm than good. Just because some uber d00d had the bright idea of naming his guild omni-pol because he couldn't think of anything original should not give him any special rights over anyone else.
4. Boring.