Hi
What do you actually want to achieve? It is not clear from your post.
There is an email field you can show in the Resource Usage view. RightClick on any current column header in the Resource Usage View and select "Insert Column" and choose "Email Address".
You can only have one formal Resource Name column in Project. You can use other custom fields, which you have done, to store other names.
Let us know what you actually want to achieve and we may be able to help you further.
Tony (OTPM)