German theologian who led the Reformation; believed that salvation is granted on the basis of faith rather than deeds (1483-1546)
"Luther argued that salvation comes through faith alone, a belief that sparked the Protestant Reformation."
Martin Luther, German monk and theologian whose teaching inspired the Reformation
"The history of the Luther family name traces its origins to a forebear who worked as a blacksmith or carpenter before taking it as his surname."
A surname, from occupations​.
The name Luther comes directly from the German word Luther, which was originally a surname before becoming widely known through Martin Luther. It entered English as a given name and remains associated with that historical figure rather than having an older meaning in its own right.