Possibly a variant of Kasai, meaning fire or river.
The exact etymology of Casai is difficult to pinpoint due to its rarity. It is often considered a modern phonetic variant of Kasai, which has roots in Japanese meaning 'fire' or refers to the Kasai River in Central Africa. In a Western context, it is frequently chosen for its unique sound and rhythmic appeal.
About 21 boys were named Casai in 2025.
US births per 5-year period, 1990–present (SSA data).
