the.com/cognomen

Latin for the nickname that quietly became your legal identity.

means A name a person goes by—often a surname or an added nickname that distinguishes them, used in formal or literary contexts as a fancy synonym for 'name.'

from Straight from Latin cognomen, built from co- ('together, with') plus (g)nomen ('name'), literally 'a name added on.' In ancient Rome it was the third part of a citizen's tripartite name—praenomen, nomen, cognomen—often starting as a descriptive nickname (one Roman family was stuck with 'Cicero,' meaning chickpea) that calcified over generations into a dignified, inherited family name. English borrowed the word intact in the 1600s, keeping its Latin skin while loosening its grip to mean any name, nickname, or alias.

origin
third Roman name, after praenomen and nomen
example
Caesar was a cognomen before it was a title
irony
often started as an insult, like Caesar meaning hairy
modern use
now just means any nickname or epithet
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