[ 2 syll. ca-sey, cas-ey ] The baby girl name Casey is also used as a boy name, and more commonly so. It is pronounced KEY-Siy- †. Casey's origin is Old Greek, Celtic, and Latin, and its use, English. From Celtic roots, its meaning is 'descendant of Cathasaigh, descendant of the vigilant one'. It is derived from the word cathasaigh with the meaning 'vigilant, wakeful'. It represents the transferred use of the surname as a given name. See Casey for more information.
In addition, Casey is a familiar form (English) of the English and Greek Acacia.
Casey is also a familiar form (English) of the English and German Cassandra.
Casey is also a familiar form of the English Cassia.
Casey is a widely used name; it has 51 forms that are used in English and foreign languages. English forms of the name include Cacee, Cacie, Caecey, Caicey, Cascy, Casea, Casee, Casen, Casi, Casse, Cassee, Cassey, Casy, Cayce, Caycee, Caycie, Cayse, Caysea, Caysee, Caysey, Caysy, Cazzi, Kasci, Kayce, and Kayse. Other English forms include the familiar forms Cass (used in Greek as well) and Kace, and the spelling variants Cacey, Caci, Cacy, Casie, Cassye, Cayci, Caysie, Kacee, Kacey, Kaci, Kacie, Kacy, Kacye, Kaissie, Kasee, Kasey, Kasi, Kasie, Kaycee, Kayci, Kaycie, Kaysee, and Kaysie. The Greek Cacia is a form of Casey that is used in foreign languages.
Casey is an all-time favorite. Today it is still somewhat popular as a baby girl name, but not as much as it was previously. The name grew in popularity from the 1960s up to the 1980s; prior to that, it was of only very modest use. At the height of its usage in 1987, 0.191% of baby girls were named Casey. It was #81 in rank then. The baby name has markedly dropped in popularity since then. In 2018, it ranked at #916 with a usage of 0.016%. Within the family of girl names directly related to Casey, Cassandra was the most regularly used. It was 52% more popular than Casey in 2018. Although there were times from 1995 to 1998 that Casey was more popular with girls, today it is used more commonly as a boy name. In 2017, 77% more boys than girls were given the name Casey.
† Pronunciation for Casey: K as in "key (K.IY)" ; EY as in "ate (EY.T)" ; S as in "see (S.IY)" ; IY as in "eat (IY.T)"