The Earth's upper mantle doesn't have a single, specific scientific name. It's typically divided into two layers:

* The lithosphere:** This is the rigid outermost layer of the Earth, including the crust and the uppermost part of the mantle.

* The asthenosphere:** This is a partially molten layer beneath the lithosphere, characterized by its ability to flow slowly over long periods.

So, while there isn't a single name for the entire upper mantle, "lithosphere" and "asthenosphere" are the scientific terms used to describe its constituent layers.