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Kätlin is an Estonian form of Katherine, ultimately derived from the Greek name Aikaterine, whose exact root remains debated but is often associated with the Greek word katharos, meaning pure. It developed as a localized adaptation of the Latin Catharina as the name spread through Christian Europe during the medieval period. The name gained popularity in Estonia partly through the veneration of Saint Catherine of Alexandria. Related forms include Katrin, Katariina, and the widely used English Katherine.