Definition
A surname or additional name; a name appended to a person's primary name to distinguish them, honor them, or describe a characteristic. In legal usage, agnomination refers to the practice of adding a secondary name or title to a person's proper name — functioning similarly to a cognomen or epithet — and by extension to the formal legal significance of such naming in matters of identity, inheritance, and record.
Common Language
Modern common usage (Wiktionary): A paronomasia or allusion of one word to another; alliteration; polyptoton; or the practice of assigning to a proper name its literal or homophonic meaning.
Historical common usage (Webster's 1913): A surname (rare); also paronomasia, alliteration, or annomination in rhetoric.
The gap between ordinary and legal meaning here is significant. In common and rhetorical usage, agnomination is primarily a figure of speech — a wordplay or sound-based connection between words. In law, the term is stripped of all rhetorical meaning and refers exclusively to a surname or appended name used to identify a legal person. A researcher encountering the word in a non-legal historical text should not assume it refers to naming practice at all.
Common Confusion
Agnomination, agnomen, cognomen, and surname are sometimes used as synonyms in legal sources but are not identical. In Roman law, agnomen was a fourth name added for a specific distinction (often a military honor or personal characteristic), while cognomen was the hereditary family name and nomen was the clan name. English legal writers frequently collapsed these distinctions. A document using "agnomination" in a strict Roman law context means something more specific than a modern "surname," while the same word in a common law deed may mean nothing more than a family name appended for identification.
Why It Matters in Research
Agnomination surfaces primarily in older property, probate, and inheritance records where a person may be identified by a primary name plus an additional descriptive or honorific name. A researcher encountering a historical deed or will that names a party with an appended title or secondary designation should understand that this agnomination may have had legal force as part of the person's complete legal identity. Variant spellings or the omission of an agnomination in successive instruments could raise questions of identity — whether two documents refer to the same individual — which courts sometimes resolved through extrinsic evidence.
The term appears rarely in modern legal writing and is not in active use in contemporary litigation or statutory drafting. Its primary research value is in decoding older English and early American legal records where Latin naming conventions persisted. Researchers working in the Law Mind corpus should note that agnomination, agnomen, cognomen, and surname are sometimes used interchangeably in historical sources but carried distinct technical meanings in Roman law that earlier English legal writers occasionally preserved.
Historical Dictionary Support
The three source dictionaries — Black's (1st and 2nd editions) and Rapalje & Lawrence — are in complete agreement: agnomination means a surname or additional name, and the term is treated as synonymous with agnomen. The entries are brief and do not attempt to distinguish agnomination from related naming concepts.
Webster's 1913, by contrast, reveals that the term carried a second meaning entirely outside the law: in rhetoric and grammar, agnomination referred to paronomasia (a play on words) or alliteration. This rhetorical meaning does not appear in any of the legal dictionaries, suggesting that legal writers had narrowed the term to its naming function and treated the rhetorical sense as irrelevant to legal discourse.
None of the historical dictionaries engage with the Roman law background that would distinguish agnomen (a nickname or honorific added to distinguish a person, often the fourth name in the Roman system) from cognomen (a hereditary family name). This gap is worth flagging: a researcher relying solely on Black's or Rapalje & Lawrence may not appreciate that "agnomination" in a classical legal text could carry more precise Roman law connotations than "mere surname."