My Goldstok family is from Rajgrod, Łomża Gubernia in Poland. We married with the Bramson family, who lived nearby in Szczuczyn.
I have several connections with the Steinsapir family of Rajgrod, see the tree link below with the marriages of two of my 5th great uncle's children with Steinsapirs:
https://www.geni.com/family-tree/index/6000000024671407422
I also have a significant DNA match with a descendant (and less so with his cousins) of a Hollander - SAPIRSTEIN Rajgrod marriage.
One branch of the Steinsapir family did take the name Sapirstein, although I don't know if that branch is related to the family I have the DNA match with.
I believe there are other Steinsapir connections with my Bramson and/or Goldstok families.
I'm looking for descendants of Steinsapir to compare notes and possibly DNA.