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Caitlín is an Irish form of Catherine, itself derived through Latin Katerina from the Greek name Aikaterine, whose precise root remains debated but is commonly associated with the Greek word katharos, meaning pure. The name was brought to Ireland by the Normans in the medieval period and became thoroughly naturalized in the Irish language. It is the direct source of the anglicized form Kathleen, which spread widely among Irish diaspora communities. Related forms include Caitlin, Catriona, and the broader family of Catherine variants found across European languages.