Educators
literally means 'the Vedic teachers in the regions around the Ganges' because they selected the profession of teaching (upadhyay)
From Wiki Entry
Ganguly or Gangopadhyay is an Indian family name of a Bengali Kanyakubja Brahmin caste.
The ancestors of Gangopadhyays are from a hermit or saint called Savarna Muni, belonging to the family of Bhrigu and thus all Gangulys have the same Savarna Gotra, and Aurva-Bhrigu-Chyavana-Aapnuvata-Jaamadagnya Pancha (Five) pravaras which means they are from the same ancestral root.