What is the meaning of the word "mother" (الأم), and why was she given this name?

The word "Umm" (أم) means mother, and the "umm" of a thing is its origin and collective essence. The mother is called "umm" because she is the origin of a human being and the place where his creation is gathered in her womb. She is his pillar. And anything to which other things are gathered is an "umm" for them.