1) English girl name 
Cassy is an English name for girls. The meaning is `alert, watchful` The name Cassy is most commonly given to French girls. The chances are 50 times greater that girls are called Cassy there. Cassy is given to boys and girls in Scotland What do they use in other countries? Casey (English) Cas Casen Kasey (English) Kace Kacey (English) Cass (English...