Effi

Effi is a term used in several separate domains, and there is no single canonical subject by that name. In literature, Effi Briest is the central character of Theodor Fontane's 1895 novel. The novel, a landmark of German realism, follows Effi's life and the social pressures she faces as a young wife in the Prussian middle class. The character’s name, often shortened as Effi, has contributed to the use of the name as a feminine given name in German-speaking regions.

As a given name, Effi may occur as a standalone name or as a diminutive form of names such as Euphemia or Effie. Its usage varies by country and over time; it is most commonly associated with German-speaking contexts but can be encountered in other European languages as well.

In contemporary usage, effi is sometimes employed as a brand or product name, chosen to convey notions of efficiency or sustainability. In branding and digital products, it may appear in company names, app names, or project labels, with capitalization and styling varying by context. Because it is a short, versatile string, its meaning is typically inferred from the surrounding context.

See also Effie, Euphemia, efficiency.