Egyptian Name for Pyramid - 'Mer"
The hieroglyphics that were used to describe these structures in Egypt are translated as the word 'mer'. The word that we use, 'pyramid', is from the Greek 'pyramis' (pl.pyrmides), wheaten cake. The Egyptians had a conical bread loaf called ben-ben, which was also the word for the capstone of a pyramid or the tip of an obelisk - ben-benet, named after the benben stone, the sacred icon in the temple of Heliopolis, the oldest center of the sun cult.
Many people try to equate different words in one country with words used in other countries and even continents. As this word shows, most words used today for many ancient things aren't even the names that were originally used. The word 'mer' probably didn't even mean a pyramidal shape, rather it was used to describe a religious use. We actually don't know how any of these word were pronounced in their original language since they weren't patterned on our alphabet or pronunciation.
The Coptic tongue started to replace the Egyptian several hundred years BCE and the last person that could actually read
hieroglyphics probably died some time in the 4th Century CE.