Irish form of Katherine, traditionally interpreted as 'pure'.
Caitriona is the Irish Gaelic form of Catherine, one of the most enduring feminine names in the Western tradition. Catherine derives ultimately from the Greek Aikaterine, a name whose etymology has been debated for centuries — plausible roots include the Greek katharos ('pure') and a possible connection to Hecate, the goddess associated with magic and the moon. The Irish form Caitriona (pronounced roughly 'kah-TREE-nah' or 'KAHT-ree-nah') carries the name's ancient lineage into the specific phonological music of the Irish language, where lenition and slender consonants give familiar names an unmistakably Gaelic texture.
The name's history in Ireland is inseparable from Saint Catherine of Alexandria, the early Christian martyr of extraordinary intellect who, according to tradition, confounded the Emperor Maxentius's philosophers in debate before her execution. Her cult was enormously popular in medieval Ireland and Scotland, and Caitriona became one of the most common women's names in Gaelic Ireland for centuries. It appears throughout the annals of Irish history, carried by noblewomen, abbesses, and ordinary women alike.
Cáit and Caitlín (from which Kathleen derives) are related forms. In the twenty-first century, Caitriona has gained remarkable international visibility through actress Caitriona Balfe, the Irish star of the television series 'Outlander,' whose profile helped bring the spelling and its Gaelic pronunciation to audiences worldwide. The name now occupies an appealing space for parents who want a genuinely Irish name — not an anglicized approximation — with deep historical roots, genuine femininity, and a sound both soft and strong.