Hasdai, or Hisday, a derivative of 'Hasadiah' (Hebrew: חֲסַדְיָה), was a Jewish Exilarch of the late 7th century AD, succeeding his father Bostanai to the office.
[1][2] Some sources allege he left no male heirs,[3] and the succession went with the descendants of his brother, Baradoi.
Alternatively, the exilarch Solomon I is said to be his son and eventually heir.
[4] Little to nothing is known about his tenure as exilarch beyond the legal dispute that he had with his Persian half-siblings and their mother.