This was posted at NamePros by betthelot:
If it helps, I can give you the other meanings of numbers in Chinese
Very useful if you are into numeric domains. Also explains why 4 is considered bad
1 single-mindedly, whole-heartedly, heart and soul
2 mandarin duck (it means that the good things appear in pairs)
3 promotion (especially in the officialdom)
4 death
5 me
6 Happy, favorable (“6” means that everything is going very smoothly)
7 eat
8 lucky (usually related to money, it means that you made a big fortune)
9 wine
10 perfect
In China, many social sites are numeric but business / manufactures tend to stick to names and acronyms. Have you wondered why some dropping NNNN.com go for double what others do, often its because they contain digits 6 and 8