Who were the people of ancient Midian and do their descendants survive until today?

The midianites had their kingdom in the westnorth of the Arabian Peninsula.

The medianites, from Media were Mesopotamian people. The Median Kingdom was located in or around the fertile crescent region of the Middle East. It was Darius the Median who stepped in and took the Kingdom when Balshazar, the son of Nebuchadnezzar, and took his kingdom, at least part of it, which was the Syrian Kingdom if memory serves me, and sharing it according to Daniels prophesy, with Persia.