Pure or alert
Casi is primarily used as a diminutive of Cassandra, meaning 'shining upon man,' or Catherine, meaning 'pure.' It can also be a variant of the Spanish name Casimira, meaning 'proclaimer of peace.' In modern usage, it often stands alone as a simplified, phonetic spelling of Cassie.
Fewer than 5 girls were named Casi in 2025.
US births per 5-year period, 1990–present (SSA data).
Country singer and contestant on The Voice
