How to hide my name in Whatsapp group? I've provided a screenshot, clickable for full size, of a group I'm in. Some people are able to hide their names. How can I do it? I do not know some people in the group and I don't want them contacting me.
Well you cannot hide names in WhatsApp at all. As you know it wont accept a blank as profile name.

1.Coming to the blank names beside the contact number is shown because the other person has saved you in his contact but his number is not saved(with a name) in your contacts list. Due to this the app will show only the contact number but not the name.

Update-  Try saving the contact with a name and then refresh your contacts in whats app for this first force stop the app then clear the cache (this works most of the time irrespective of the make or mode of internet )

2.You may be using an older version of the application.(you have not specified the version so it can also be the problem).

3.You could be blocked by the other person so you cannot see his name initially(later last seen and then the display pic)

If the above still do not solve your problem then try reading the faq 1 and faq 2