A more controversial point is the surname Wallace. It means "Welshman". It is possible that all the Wallaces in the Clyde area were medieval immigrants from Wales, but given that the term was also used for local Cumbric speaking Strathclyde Welsh it seems equally if not more likely that the surname refers to people who were seen as being "Welsh" due to their Cumbric language. Surnames in Scotland were not inherited before 1200 and not regularly until 1400. William Wallace (known in Gaelic as Uilleam Breatnach – namely William the Briton or Welshman) came from the Renfrew area – itself a Cumbric name. Wallace slew the sheriff of Lanark (also a Cumbric name) in 1297. Even if he had inherited the surname from his father, it is possible that the family spoke Cumbric within memory in order to be thus named.