A secondary name or nickname for a person, often describing a characteristic, origin, or habit (like 'William the Conqueror').
From 'by' (secondary, additional) + 'name.' The term emerged in Middle English to describe the nicknames and descriptive titles that people added to their given names, especially in medieval times when many people shared the same first name.
Before last names became standardized, people relied on bynames to tell each other apart—so you might be 'John the Baker' or 'Margaret from the Hill.' These bynames eventually evolved into our modern surnames!
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