Sakya

Sakya school of Tibetan Buddhism is one of the four main sects of Tibetan Buddhism. Other are Nyingmapa, Kugyu, and Gelug. The name is the sect derives from the Sakya Monastery, The principal monastery in Tsang near Mt Everest Basecamp in Tibet. The Word Skaya means the pale earth, derived from the unique grey earth of Ponpori Hill where the monastery is located.

https://itibettravel.com/tibet/tibetan-religion/tibetan-buddhism-2/sakya-sect-of-tibetan-buddhism/