Begum Zia an Arab? Her parents last name was Majumdar, I never knew Majumdars are Arab! :/
For your information, the spelling of Majumadar is little flawed in Bengali. It is actually, 'MAJMUDAR.' It is basically a muslim title was taken permanently by some muslim and hindu families during Muslim rule. Like Kanungo, Hazari, Talukdar it is also related to a group of people who were govt assigned officers working with the land and settlement department during Nawabi. So, this is why both muslims and hindus have this title.