Pebble or stone
Derived from the French word 'caillou', meaning a small stone or pebble. It is rarely used as a given name in the English-speaking world and is most famously associated with the Canadian children's media franchise. In French slang, it can also colloquially refer to a 'bald head'.
Fewer than 5 boys were named Caillou in 2025.
US births per 5-year period, 1990–present (SSA data).
Four-year-old protagonist of the eponymous educational series · Caillou
