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The King’s Converts: Jewish Conversion in Medieval London, by Lauren Fogle (Rowman & Littlefield, 26 Nov 2018)

Converse Name Meaning
From Middle English, Old French convers ‘convert’ (Latin conversus, past participle of convertere ‘to turn’), hence a nickname for a Jew converted to Christianity, or more often an occupational name for someone converted to the religious way of life, a lay member of a convent.

Source: Dictionary of American Family Names ©2013, Oxford University Press