Oyrotho, nomi mugulhoi garbist (derbetho, baitho, torgutho, khoshutho, zakhchiho va gayra), ki dar guzashta muttahid budand. Asri 17 yak qismi Oyrotho ba mahali Kukunor, digare ba hududi Rossiya kuchida, nomi qalmoqhoro giriftand, guruhi seyum aholii asosii khonii Oyrotro tashkil dod.
Dar Respublikai Khalqii Mongoliya istilohi «Oyrotho» ahamiyatashro gum kardaast. Guruhi mugulhoi garbiero, ki bo mugulho-khalkha omekhta shudaand, derbetdo, bantho, zakhchiho va gayra menomidand va beshtar dar aymoqhoi Ubsunur va Kobodo zindagi mekunand (shumoraashon 155 hazor, 1978). Guruhi ziyodi Oyrotho ba hayati mugulhoi RKhKh dokhiland.