In my work I sometimes order genetic analyses, and I’ve been told to be more liberal with these if the patient is an Ashkenazi Jew. (Some relevant gene variants are more common in this community than in the majority population of my country.) I wasn’t familiar with the term, and figured it was a group size-wise similar to the Hasidic community - some 130k people worldwide. It took me watching #JewishMatchMaking to learn that I was off the mark by a factor 100. A reminder as good as any to stop making assumptions when ignorant on a subject and Google instead.