Cathi is a feminine name primarily serving as a diminutive or variant spelling of Catherine or Cathy. Derived ultimately from the Greek name Aikaterine or Hekaterine, its meaning is debated but possibly relates to the Greek word "katharos" meaning "pure." This shortened form emerged as a friendly nickname before sometimes becoming used as an independent given name. The distinctive spelling with an 'i' ending gained some popularity in the mid-20th century, particularly in the 1950s-1970s in America, offering a slightly unique twist on the more common Cathy. The name conveys a casual, approachable quality while maintaining connections to the classical Catherine. Its usage has declined in recent decades as naming trends have shifted.