Definition
The name or title under which a partnership or unincorporated business conducts its affairs and holds itself out to the public. The firm name functions as the collective identity of the business — it is the label under which partners contract, sue and are sued, and carry on trade.
At common law and in traditional partnership practice, a firm name could be the surnames of the partners (e.g., "Smith & Jones"), a purely descriptive or invented name, or a combination. The firm name is legally significant because it determines how the partnership is identified in contracts, court filings, and commercial dealings. It is not, by itself, a separate legal entity; the firm name is a label for the underlying association of persons who share liability.
A firm name must be distinguished from a corporate name or trade name. A corporation's name identifies a legal entity separate from its owners; a firm name, in the partnership context, identifies a group of individuals who remain personally liable even when trading under a collective designation.
---
Common Language
Modern common usage (Wiktionary): "Firm" in general English refers to a business or company, particularly a professional practice such as a law firm or accounting firm. "Firm name" would naturally be understood as the name of any such business.
Historical common usage (Webster's 1913): Webster's defines "firm" as "the name, title, or style under which a company transacts business; a partnership of two or more persons; a commercial house."
The gap between common and legal meaning here is narrow but worth noting. In common usage, "firm" has expanded to describe almost any business, including corporations and sole proprietorships. In strict legal usage, "firm" retains its historical meaning as a partnership or unincorporated association, and "firm name" specifically denotes the collective trading name of such an entity — not merely any business's name. Researchers should not assume that historical sources using "firm name" are speaking to corporate or LLC identity questions.
---
Common Confusion
FIRM NAME vs. TRADE NAME vs. ASSUMED NAME: These terms overlap but are not identical. A trade name (or fictitious name, or "doing business as" name) is any name under which a person or entity conducts business that differs from their legal name — it can apply to corporations, LLCs, sole proprietors, and partnerships alike. A firm name is a subset concept: the trade name of a partnership specifically. An assumed name registration statute (common in U.S. states) may govern both, but the triggering question — whether any registration is required — often turns on whether the firm name includes all partners' surnames or uses a different designation. Researchers working in historical sources should be alert to this layering.
FIRM NAME vs. FIRM OFFER: The word "firm" appears in both concepts with entirely different meanings. A firm offer (contracts law, especially UCC § 2-205) is an offer by a merchant that is irrevocable for a stated period without consideration. The connection to "firm name" is purely orthographic. See the ENCYCLOPEDIA CROSS-REFERENCE section below.
---
Why It Matters in Research
The practical legal significance of firm name has shifted considerably over time and varies with the rise of statutory business forms.
In the 19th and early 20th century — the period most relevant to Bouvier's — partnership was the dominant form of multi-person business, and the firm name was the primary means of identifying a commercial enterprise in court records, contracts, and trade directories. Researchers reading historical cases, deeds, or commercial instruments will encounter firm names where a modern document would use a corporate or LLC name. Understanding that "Smith, Jones & Co." is a firm name — and thus that individual partners may be personally liable behind that name — is essential for accurately interpreting historical legal documents.
Jurisdictional variations in assumed name and fictitious business name statutes mean that whether a firm name needed to be publicly registered, and what consequences flowed from failure to register, changed dramatically across states and across time. A firm operating under a name that didn't include all partners' surnames often had to file a certificate of assumed name or face penalties including unenforceability of contracts in some jurisdictions.
In the Law Mind corpus, researchers should note that entries touching firm name will connect to partnership law generally, trade name and fictitious name registration, and the procedural question of how partnerships are named as parties in litigation. The Bouvier's entry is deliberately brief, pointing readers to the main FIRM entry — a structural cue that firm name is a dependent concept, not a standalone doctrine.
---
Historical Dictionary Support
Bouvier's Law Dictionary defines "firm name" simply as "[t]he name or title of a firm in business," with a cross-reference to the FIRM entry. This brevity is itself informative: Bouvier treats firm name as a derived concept, its legal content flowing from the definition and rules applicable to the firm (partnership) itself rather than from any independent doctrine of naming.
Bouvier's placement of FIRMA immediately after FIRM NAME is a reminder that the Latin root — connoting a farm, rent, or tribute — is etymologically present in the term but legally irrelevant to firm name in the partnership sense. Researchers should not import meanings from FIRMA (which concerns feudal land tenure and royal provisioning customs, drawn from Spelman and Domesday) into modern firm name analysis. The proximity of these entries in alphabetical dictionaries has occasionally created confusion in older secondary sources.
Other historical dictionaries in the common law tradition (e.g., Burrill's Law Dictionary, Black's early editions) similarly treat firm name as derivative of partnership doctrine, requiring researchers to trace through the partnership entries to understand the full framework.
---
Jurisdictional Note
U.S. states vary significantly in their fictitious and assumed name registration requirements as applied to partnerships. Some states require registration whenever the firm name omits any partner's surname; others require registration for any name other than the partners' full legal names; a minority impose no general registration requirement. Failure to comply historically produced consequences ranging from civil penalties to unenforceability of contracts made under the unregistered name, though modern courts have varied in how strictly they apply such consequences.
---
Encyclopedia Cross-Reference
The Law Mind Contracts & Commercial Law Encyclopedia:
— contracts_15: Option Contracts and Firm Offers (for the distinct contracts-law concept of "firm offer")
— contracts_112: UCC Article 2 — Firm Offers (§ 2-205) (same caution; entirely separate doctrine)
---