1) English girl name 
Cassida is a large genus of tortoise beetles in the subfamily Hispinae. Several species of Cassida are important agricultural pests, in particular C. vittata and C. nebulosa on sugar beet and spinach. The thistle tortoise beetle (Cassida rubiginosa) has been used as a biological control agent against Canada thistle. ...
Cassida is a genus of leaf beetles (Chrysomelidae) and are sometimes pests of beet and turnip.