Caillou is a French given name meaning "small stone" or "pebble". It's of French origin and is often given to boys. In the French language, it's pronounced as /kɑj.ju/. The name Caillou has gained popularity in recent years, particularly due to its use in the popular children's television series "Caillou", which follows the life of a curious and imaginative four-year-old boy named Caillou.
"The name Caillou saw its peak popularity between 2001 and 2003 with over 30 births per year each year. However, from 2004 onwards, the number of births dropped significantly, ranging from a high of 22 in 2005 to a low of 5 in 2017. Overall, there were 247 babies named Caillou between 2001 and 2017."