The ax, also spelled "axe" outside of the United States, has no known inventor due to the fact that there is no definite way to determine when or where it was created. There is evidence that it was first made around 1.6 million years ago. There were numerous uses and types of axes from this time period.
The most common axes of this time period are referred to as Acheulean axes. These were some of the earliest known axes on the planet. They came in various shapes, sizes and were made of stone. The stone is called bifacial because it is flaked over part of the surface on both sides of the stone. These tools were used for cutting wood, digging and for butchering meat.