Thank you for clarifying that.  It is confusing because in addition to seeing it used as this Rabbi's surname in multiple sources, I do see it used as a surname in a lot of other records on JewishGen, like the example below.  I thought I was on the right track since a number of these records with this name are from the same region and timeframe as where this Rabbi lived and worked, so I assumed they might be relatives, but I guess based on what you say they are all likely errors.  Thank you again.