The team's current position on the issue:
All sites will stick with their topic.stackexchange.com names until such time as they reach traffic levels roughly around what Server Fault currently has (~38k visitors/day).
[...]
So, feel free to pick a name, and if it's good we'll try to use it in..
- site redirects (so seasonedadvice.com will redirect to cooking.stackexchange.com)
- site visuals (graphic logo tagline)
- site tagline text