78%RatingSave Gender Feminine & Masculine Usage English (Modern) Pronounced Pron. /ˈkæs.ɪ.di/ [key·simplify] Meaning & HistoryExpand Links From an Irish surname (Anglicized from Irish Gaelic Ó Caiside), which is derived from the byname Caiside. Very rare as a given name before the 1970s, it established itself in the 80s and then surged in popularity during the 90s. Related NamesFamily Tree·Details VariantKassidyDiminutivesCass, Cassie, Cassy PopularityDetails Last ranked #96 in 2004 Canada Last ranked #729 in 2022 England and Wales Last ranked #496 in 2023 (f) #987 in 1992 (m) United States People think this name isRate·Details youthful natural wholesome refined strange Categories 1980s, 1990s, derived from a surname, Five Nights at Freddy's characters, love island Australia, male to female, modern English, Pokemon characters, producers, Sims 3 characters, sports pundits, surnames, teen idols, Tori Amos lyrics, TV presenters, WITCH characters, y vowels