Meaning and name origin
Catelyn \c(a)-tel-yn, cat(e)-lyn\ as a girl's name is of Old French and Greek origin, and the meaning of Catelyn is "pure". Catelyn is a variant of Caitlin (Old French, Greek): Caitlín is the Irish Gaelic form of Cateline, which is the Old French form of Katherine, whose source is the Greek name Aikaterine.
Catelyn is not a popular first name for females and an equally uncommon surname or last name for all people (2000 U.S. Census).
Displayed below is a comparison of the popularity of the girl name Catelyn and its variant forms. Popular variation forms ranked in the Top 1000/100 are Katelyn (#172), Caitlin (#496), Katelynn (#567) and Katelin. (2014 statistics).
Catelyn is also pronounced similarly to Catalin and Katilyn. Other suggested similar baby names are Caelyn, Caitlyn▼, Cathelin, Cathlyne, Catlin, Catlyn and Catlynn. These names tend to be more commonly used than Catelyn.