The only examples I can think of of those who had no ‘friends’ at all would be the various hermit saints. In particular, the Carthusian saints.
None are named, because the Carthusians live in total obscurity, their order’s charism is to make saints, not to tell people about them. If they publish devotional work, it’s published anonymously, they are buried in unmarked graves.
I am told of one story by a man who was a Carthusian novice, there was a brother in a Charterhouse in Spain who was asked to go and dig a grave for a recently departed brother. His spade hit something soft and squishy, even though it was the ‘oldest’ end of the graveyard, nobody had been buried there for maybe a hundred years. He pulled away the soil and found an incorrupt body. He went running to the abbot, shouting “we have an incorrupt saint, we have an incorrupt saint!” The abbot raised an eyebrow, and said, “fill in the hole and dig a few feet to the left of him.”
There are only 4 named Carthusian saints, all founders or martyrs, the rest are in obscurity in this world. All the same, you can be sure there is power in heaven if you ask “All Carthusian saints, pray for us”.