1) German surname 
Halberstam, meaningless in its current form, is altered from an older name, Halberstadt, used by many descendants of Rabbi Tzvi Hirsh (died 1748), the rabbi of Halberstadt. The change of Halberstadt to Halberstam is often thought to have been implemented by Rabbi Chaim Halberstam of Sanz (Nowy Sącz), as implied by Rabbi Yechezkel Michelsohn of P