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Finnian (from Old Irish finn "white" or "fair combined with a diminutive suffix) is the name of a bunch of Irish Saints.
St. Finnian of Clonard is probaby the most widely known St. Finnian - he was one of the Twelve Apostles of Ireland and called "The Teacher of Irish Saints" because a number of students at his school became very prominent ecclesiastics. He founded Clonard Abbey in modern-day County Meath.
St. Finnian of Clonard's feast day is the 12th of December.