Rejoice, sea, or lord
Cai has multiple etymological roots. In Welsh tradition, it is a form of Kay, likely derived from the Latin Gaius meaning 'to rejoice'. In Chinese, it can mean 'colorful' or 'wealth', while in Vietnamese it often means 'female' or 'lord'.
About 69 boys were named Cai in 2025.
US births per 5-year period, 1990–present (SSA data).
A Knight of the Round Table and King Arthur's foster brother · Arthurian Legend
Chinese inventor of paper and the papermaking process
Contemporary Chinese artist known for gunpowder works
