Reply To: Zelensky is jewish and so is kamala harris’ stepdaughter

You need to trace the maternal ancestry back at least 200 (or at least until someone who you can establish was frum). For Ashkenazim, the movements towards intermarriage and people going OTD in large numbers began about 250 years ago. Since the Euro-American custom is for a child to have the father’s surname, the name itself gives you no useful information about whether the great-great-great-grandmother was a Yid.