Pure
Catelyn is a modern phonetic variant of Caitlin, which is the Irish form of Catherine. It ultimately derives from the Greek name Aikaterine, which has been associated with the Greek word 'katharos', meaning pure.
US births per 5-year period, 1990–present (SSA data).
Lady of Winterfell and matriarch of the Stark family · A Song of Ice and Fire
The birth name of Catelyn Stark · Game of Thrones