@Tambien
Some lesser known ones:
Finland Swedes in Finland.
Lebanese in West Africa.
Circassians and Armenians in Arab countries.
Alawites in Syria.
Portuguese in Angola and Mozambique.
Parsis in India.
Ethnic Germans in Hungary, Belarus, Ukraine, Russia, and Kazakhstan.
People with the last name Junker in German countries.
Ottoman Turk descendants in the Maghreb called Kouloughlis.
Copts in Egypt (while they are not politically relevant, they have better socio-economics than Muslim Egyptians).
Christian Levantine Arabs in Latin America.
....this one nobody knows about: stateless Indians in Madagscar called Karanas:
Citizenship Along Ethnic Lines: The Disenfranchised Indians of Madagascar
Madagascar's restrictive citizenship policy is not an outlier but a trendsetter as countries around the world look to preserve their ethnic mix or wholly exclude communities.thewire.in
Stateless yet economically dominant.
I'll add one more
Native Emiratis in UAE