Definition
A surname; a name added to or placed over a person's given name to further identify them. The term derives from Law French and refers to what is now commonly understood as a family name or last name — the heritable name shared among members of a lineage or household, as distinguished from a person's baptismal or given name.
Why It Matters in Research
Researchers encountering this term will find it almost exclusively in early English legal records and texts written in Law French — the hybrid legal-French dialect used in English courts and legal writing from the Norman Conquest through the seventeenth century. Its appearance in Britton (a thirteenth-century treatise on English common law) places it firmly in medieval legal usage. Outside of that narrow historical window, the term does not appear in modern legal writing; any modern document using it would be either antiquarian or in error.
The practical research value of understanding surnosme lies in surname identification within historical records. Medieval English legal documents — plea rolls, court rolls, inquisitions post mortem, and similar instruments — often recorded names inconsistently, sometimes using only a given name, sometimes a locative designation, and sometimes a heritable surname. Knowing that surnosme denotes the surname specifically helps a researcher parse naming conventions in documents where the distinction between a given name, a locative byname, and a true heritable surname is legally significant (for instance, in identifying parties across multiple records or tracing inheritance claims).
Do not confuse this term with mere bynames or epithets, which in the medieval period were not always heritable. The legal use of surnosme implies the name that attaches to the legal person across time and across generations — a distinction that courts in land and inheritance matters cared about.
Historical Dictionary Support
Burrill's Law Dictionary defines surnosme as "a surname; an over-name," citing Britton, chapter 48. The compound structure — sur (over, above) plus nosme (name) — transparently conveys its meaning and connects it to the broader Law French vocabulary of personal identity in legal proceedings. Burrill's adjacent entry for surplus (surpluis, "excess") appears to be a coincidental alphabetical neighbor, not a related term.
Historical dictionaries beyond Burrill offer little additional treatment of surnosme as a distinct legal term of art. The term's limited coverage reflects its status as descriptive vocabulary rather than a term with independent legal doctrine attached to it. Britton, the source Burrill cites, is one of the earliest systematic treatises on English law, attributed to John le Breton and composed around 1290. Its citation anchors surnosme in the formative period of English common law record-keeping.
Jurisdictional Note
This is a term of English legal history with no modern jurisdictional significance. It does not appear in American, Canadian, or contemporary English legal usage. Its relevance is confined to research in medieval and early modern English legal sources.