The name Kathryn is a girl's name meaning "pure". Kathryn is ranked #424 on our popularity charts and is often added to lists like Names That Mean Pure and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
Although the Kathryn spelling feels like a modern streamlining of this ancient royal and saints' name, it is in fact found back through history. At least one of Henry the Eighth's unfortunately wives sometimes spelled her name as Kathryn.
While Katherine is the number one spelling of the name these days and Catherine number 2, the Kathryn form is well-used if not exactly modern-feeling. Two recent Kathryns of note: Academy Award-winning film director Kathryn Bigelow and bestselling novelist Kathryn Stockett.