A very quick google would have given your the answer:
Ethereum creator Vitalik Buterin has proposed an answer to one of Ethereums more common questions whether or not the cryptocurrencys coin supply should ever be capped. In an Ethereum Improvement Proposal (EIP) on April 1st, Buterin wrote:
I recommend setting MAX_SUPPLY = 120,204,432, or exactly 2x the amount of ETH sold in the original ether sale.
It was a joke on April 1, but after many people supported this idea, he said that he seriously thought over it
The only possible thing for us just wait about EIP1011 to be implemented and i heard that there will be a hardcap for the ethereum maximum supply which around 121 millions ethereum.
Or if in this year the EIP1011 will have already implemented and then we will see the maximum supply below 121 millions