WHAT ARE THE OTHER SIX HEADS?

"And I stood upon the sand of the sea, and saw a beast rise up
out of the sea, having seven heads and ten horns, and upon his
horns ten crowns, and upon his heads the name of blasphemy.
And the beast which I saw was like unto a leopard, and his feet
were as the feet of a bear, and his mouth as the mouth of a lion:
and the dragon gave him his power, and his seat, and great
authority. And I saw one of his heads as it were wounded to
death; and his deadly wound was healed: and all the world
wondered after the beast." (Revelation 13:1-3)

Why do people say that this one head that is wounded is 'the antichrist'?
If this one head is THE antichrist, what are the other six heads?
Revelation 13:11-12 says;

"And I beheld another beast coming up out of the earth;
and he had two horns like a lamb, and he spake as a dragon.
And he exerciseth all the power of the first beast before him,
and causeth the earth and them which dwell therein to
worship the first beast, whose deadly wound was healed."

This second beast causes everyone to worship the first 'beast'. It' doesn't say that this second beast causes everyone to worship the one head that was wounded.

Many people are expecting the scenario that happened in the famous novels. I think some of them think that the name of the antichrist will be Nicolai.