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All names could be changed around and before the 14th century, in England, Scotland and Ireland anyway. The Welsh, and some others on the Celtic fringe, still didn't have surnames.
Do you mean change to another location as the bearer moved around? Or changed to another type of name? I can give you an example of the latter. There is a Yorkshire surname Clappison. The original name was Clapham, from a place in West Yorkshire. When other Yorkshire peole began to adopt surnames in the 14th century the common form was a patronymic ending in son - Wilson, Thompson, etc.
Some Claphams decided to get in fashion and changed their name to Claphamson, later corrupted to Clappison.