Purity or unheeded prophetess
Cassy is primarily used as a diminutive of Catherine, meaning 'pure', or Cassandra, which refers to a prophetess in Greek mythology whose warnings were never believed. While it evolved as a nickname, it is occasionally used as a standalone given name. Its usage has declined significantly since the late 20th century.
Fewer than 5 girls were named Cassy in 2025.
US births per 5-year period, 1990–present (SSA data).
American journalist and writer
An enslaved woman who escapes in the novel · Uncle Tom's Cabin
