Costache

Costache is a Romanian given name, typically masculine. It is considered a diminutive or a familiar form of the name Constantin. As such, it shares the same etymological roots, ultimately deriving from the Latin "Constantius," meaning "constant" or "steadfast."

The name Costache is used less frequently as a formal given name and is more commonly employed as a nickname or affectionate designation within families and close social circles. Individuals formally named Constantin may be addressed as Costache by those who know them well.

The name’s usage is largely confined to Romania and regions with Romanian diaspora communities. The prevalence of the name has decreased in recent decades, reflecting broader trends in naming conventions and preferences.