means Enormous, of huge size — used to describe something massive in scale or scope, named after the giant prehistoric elephant.

from From the Russian "mamont," the name for the great tusked beasts whose frozen carcasses kept turning up in Siberian permafrost. The Russian word may trace to an Indigenous Siberian source — possibly Mansi or another Ob-Ugric language — though its deeper roots are murky. English borrowed it in the early 1700s, first for the animal itself; the figurative "huge" sense came later, as people grasped just how vast the creatures had been.