Why use real name
From NMR Wiki
Entering full name (both first and last names) is required for registration at NMR Wiki so that every edit is properly signed (just like the journal publication).
In fact it is best if you provide your name in the same format it is shown under the title of your publication in the real journals. This will help make NMR Wiki a more credible resource.
If you also choose your user login name as Firstname Lastname as well - your every edit log will be directly (in history and recent change views) associated with your name in the edit history and recent changes page.