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Caitlín is an Irish form of Katherine, itself derived from the Greek name Aikaterine, whose root meaning is debated but commonly associated with the Greek word katharos, meaning pure. The name entered Ireland through the Old French form Cateline, brought by Anglo-Norman settlers in the medieval period. Caitlín became firmly established in Irish-speaking communities and is the standard Irish-language equivalent of Katherine and its variants. Related forms include Caitlin, the anglicised spelling that has gained widespread independent use, as well as Catherine, Katharine, and the Scottish Gaelic Catrìona.