Kondratyev

Kondratyev is a surname of Russian origin. It is derived from the given name Kondrat, which itself is a Russian form of the Latin name Conrad. The name Conrad has Germanic roots, meaning "bold counsel" or "brave advisor." As a patronymic surname, Kondratyev would have originally indicated "son of Kondrat."

Notable individuals bearing the surname Kondratyev include Nikolai Kondratyev, a Russian economist famous for his work on long-term economic cycles, often referred to as Kondratyev waves. These waves are characterized by long periods of economic expansion and contraction, typically lasting 40-60 years. His theories have influenced economic thought and continue to be debated and analyzed. Another prominent figure is Valery Kondratyev, a Russian scientist and academic who has made contributions in fields such as atmospheric physics and space research. His work has focused on the study of Earth's atmosphere and its interaction with solar radiation. The surname is not exclusively tied to these individuals, and many others may share it across various professions and regions.