Of these Pokharna and Dahima/Pundir are interesting. The Pokharna may not have been brahmans initially. Or they may have been Bhojak/Shak brahmans, became Parasari mendicants*, and then came back to the brahman fold.
*
parasari brahmanyah jagati durlabhah
parasharino bhikshavah
parasharya bhikshusutra
"The Buddhist mendicant Divakaramitra has been styled as a Parasari Bhikshu.
The first mention of the Parasari Bhiskhu occurs in Panini (4.3.110). It is mentioned there
that the students of the Bhikshu-sutrara of Parasara were known as Parasarin. ... It has been mentioned earlier that the mendicant of Parasarin sect washed their
hands and feet with water contained in their Kamandalu pots, and then performed the cere-
mony of Chaitya-vandana, i.e., salutation to the Chaitya or Stupa. Bana has gone to the
length of stating that no Parasari Bhikshu existed in his time who loved a Brahmana."
https://archive.org/stream/in.ernet....arsha_djvu.txt