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)
Actually, its a hack for WhatsApp. I should say that it is a bug in WhatsApp that if you copy this ⇨ ຸ from here and paste in place of your name or about and then delete the ⇨ then tap save, then you name or about will not show. There would be empty spaces instead. WhatsApp, on its official website (FAQs), says that status can't be empty but you can using this trick. So it's a loophole actually. For status, if it doesn't go empty by that trick, just try to paste the ⇨ ຸ and delete both the characters, i.e., ⇨ as well as ຸ and then save to see if it works. But if you are a professional, you might want strangers to recognise you right away.