Did you mean Carpatho-Russian, or Carpatho-Rhytian? The CRs are the Orthodox Cossack sent into the Carpathian mountains by the Czar about 1810 to drive out all the "Swedes" (Mostly Sa'ami hard metal miners looking for gold/silver/tin/iron/zinc/etc.)
Those folks had their own language ~ closely related to Skolt ~ and the ones who left to go back to Sweden, and Finland (also the Czar's personal possession), recently disappeared as a linguistic minorty. The last speaker, an elderly woman, passed on.
A tribe of humanity is gone and I was there in spirit if not in fact ~ I had just found out about them weeks before they expire from this world.
A friend of mine was a Carpatho-Rhytian. He died some years back, but he related that the news back home in Pennsylvania was grim. The congregation was getting old and they were going to need to install pews ~ gasp! ~ to seat the elderly for services, but they did have central heat in the old church.
Your kind are not as invisible as you might imagine.
The church is referred to as the American Carpatho-Russian Orthodox Greek Catholic Church. I’ve also heard of this particular group of people referred to as Ruthenians. Ethnically, they were from southern Poland, Slovakia, and Ukraine. When I asked about their language, they just called it “slavic.” They have their own style of plain chant that is used in the services