Rex is a moderately popular boys' name in England & Wales, ranking #228 in 2025 with 217 recorded births. The name reached its all-time peak in 2021 with 396 births ranking #142. Since 1996, the popularity has increased by 2,612.5%. In 2025, approximately 1 in every 1,253 boys born was named Rex. FALLING Recent data shows the name is currently falling.
Rex is a brisk, bold Latin name meaning king. Its strength comes from being so short and direct.
The word itself is ancient, but its use as a given name belongs more to the modern taste for compact, forceful names. It has remained recognisable through its unmistakable meaning.