Adding to Erland's tidbits:

3) Having a meaningful name for the owner is useful in some environments. In the simple scenario, a single name like Erland's works great. You always know what that role is used for. In your case, it sounds like you might have a requirement to isolate dev, test and prod access controls so having a prefix or postfix indicating dev, test or prod accomplishes the same goal: you always know what that role is for. I would not do it for the user though. If you grant access via roles then the same person will connect with the same login and user IDs but will have the appropriate permissions based on the role he's in. No need to remember 3 IDs plus you're creating management grief for yourself and user confusion by attaching dev, test or prod to logins or user names.