Thanks for the response. I have no data on Glaser or Gleser nor from Suvainishok. The only approach I have found for the Yehuda/Yudel is to look into the patronymics if I have enough data which is rarely the case. This is one of the reasons I set about setting up my database. I have not included Yudelson.. in my data because of the volume even though I know some are probably related.
