590 F.2d 168 (5th Cir. 1979)
Brennan's, Inc. v.
Whether the "Brennan's" surname had acquired protectable secondary meaning for restaurant services and, if so, whether defendants' use of the same name and similar branding in a different market created a likelihood of consumer confusion warranting injunctive relief under the Lanham Act, including restrictions on how and where the name could be used.
Under the Lanham Act, infringement of a mark or trade name occurs where a defendant's use of a mark in commerce is likely to cause confusion, mistake, or deception as to source, sponsorship, or affiliation. Surnames are generally considered descriptive and are protectable upon a showing of secondary meaning—i.e., that the consuming public has come to associate the name with a single source. The likelihood-of-confusion analysis is multifactorial and commonly considers: (1) the strength of the plaintiff's mark (including secondary meaning), (2) similarity of the marks, (3) similarity of the services, (4) similarity of outlets and customers and the identity of advertising channels, (5) defendant's intent, (6) evidence of actual confusion, (7) purchaser care and sophistication, and (8) the likelihood of expansion of product lines or markets. Equitable remedies under the Act may include prohibitory injunctions, tailored limitations (e.g., prominent disclaimers, geographic qualifiers), and restrictions on confusing trade dress or advertising when necessary to dispel confusion.
The Fifth Circuit upheld the district court's determination that "Brennan's" had acquired secondary meaning identifying plaintiff as the source of restaurant services and that defendants' use of the same name and closely similar branding in a neighboring market was likely to cause confusion. The court affirmed tailored injunctive relief restricting defendants' use of the "Brennan's" name in ways likely to confuse consumers—including prohibitions on confusing trade dress and advertising—while permitting limited, non-misleading uses consistent with measures designed to avoid confusion.
Brennan's is a teaching case on three fronts. First, it confirms that surnames can become powerful marks when they acquire secondary meaning, and the right to use one's own name in business yields to the Lanham Act when confusion is likely. Second, it illustrates the Fifth Circuit's multifactor likelihood-of-confusion analysis applied to service marks and trade dress, with particular attention to actual confusion and overall commercial impression. Third, it showcases remedial flexibility: courts can craft nuanced injunctions—requiring disclaimers, geographic qualifiers, and changes to presentation—to neutralize confusion without imposing a categorical ban where equities counsel restraint. For law students, it's a blueprint for pleading and proving secondary meaning, marshalling confusion evidence, and arguing for (or against) tailored injunctive relief.