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Caitlín is an Irish form of Catherine, ultimately derived from the Greek name Aikaterinē, whose precise root is debated but commonly associated with the Greek word katharos, meaning pure. The name was brought to Ireland through the Old French form Cateline, introduced during the Norman period, and gradually adapted to suit Irish phonology and spelling conventions. It is the Irish-language equivalent of the English Katherine and is closely related to forms such as Kathleen, Caitlin, and Katelyn, all of which share the same ancestry.