Meaning and name origin
Catlyn \c(a)-tl-yn, cat-lyn\ as a girl's name is of Old French and Greek origin, and the meaning of Catlyn is "pure". Catlyn 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. A name for girls that is not broadly used. See also Katherine.
Catlyn is not a popular first name for females and an equally uncommon surname or last name for all people (Source: 2000 U.S. Population Census).
Displayed below is a comparison of the popularity of the girl name Catlyn and its variant forms. Popular variation forms ranked in the Top 1000/100 are Katherine (#83), Kaitlyn (#158), Caitlyn (#463), Caitlin (#496), Kaitlynn (#928), Kaitlin and Caitlynn. (Source: 2014 Birth Name Statistics).
Catlyn is also pronounced similarly to Catleen, Katlin▼, Katlyn▼, Katlyne, Katlynn and Kitlyn. Other suggested similar baby names are Caelyn, Cailyn▼, Caitlen, Calyn, Carlyn, Catalin, Catelan, Catelyn, Catelynn, Cathlyne, Catlina and Caylyn. These names tend to be more commonly used than Catlyn.