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Catriona is an Irish and Scottish Gaelic 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 was borne by early Christian martyrs, most notably Saint Catherine of Alexandria, which helped spread its use across medieval Europe. The Gaelic spelling Caitríona reflects the phonological conventions of Irish, and the name remains widely used in Ireland and Scotland today. Closely related forms include Katrina, Catriona, Katerina, and the anglicized Catherine and Karen.