76%RatingSave Gender Feminine & Masculine Usage English (Modern) Pronounced Pron. KAS-i-dee [key] Expand Name LinksMeaning & History From an Irish surname which was derived from Ó Caiside meaning "descendant of CAISIDE". See All Relations · Show Family TreeRelated Names VariantKassidyDiminutivesCass, CassieMasculine FormCass See Popularity DetailPopularity Last ranked #58 in 2004 Canada (BC) Last ranked #327 in 2017 (f) #986 in 1992 (m) United States Categories male to female, modern English, Pokemon characters, surnames, trendy, Y vowels Entry updated January 22, 2019