As shown by the text below, the 7-headed wild beast has a name.
16 And it puts under compulsion all persons, the small and the great, and the rich and the poor, and the free and the slaves, that they should give these a mark in their right hand or upon their forehead, 17 and that nobody might be able to buy or sell except a person having the mark, the name of the wild beast or the number of its name. 18 Here is where wisdom comes in: Let the one that has intelligence calculate the number of the wild beast, for it is a man’s number; and its number is six hundred and sixty-six. Revelation 13:16-18
So what is the beast's "name"? Of course the beast's "number" is "666" -- but that's not it's "name". The beast's name and number are two different things. The Bible does indeed tell its readers what that NAME is. I know the beast's name, do you?