Rabbi Barukh Bendet and his son Yoel bore the surname GRAD. In this case BENDET was a personal name and had nothing to do with a surname BENDET or BENDETSON.
Chaim Freedman Petah Tikvah, Israel
..... and it's worth noting that the given name Bendet or Bendit is ultimately a shortened form of Benedict. Benedict is Latin for "blessed" (i.e., it actually translates the word Barukh) -- so the double-barreled given name Barukh-Bendet should be quite common.
