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The name Caitríona is the Irish Gaelic form of Katherine, ultimately derived from the Greek name Aikaterinē, whose precise root remains debated but is most commonly associated with the Greek word katharos, meaning pure. The name was brought into widespread use across Europe following the veneration of Saint Catherine of Alexandria. Caitríona is the standard Irish-language rendering, pronounced roughly kah-TREE-nuh, and it shares its origin with cognates such as Katherine, Catherine, Katrina, and Catriona, the Scottish Gaelic equivalent.