The name Caily is of Irish origin, derived from the Gaelic name Caoláidh. It is composed of two elements: 'caol' meaning 'slender' or 'slim', and 'aidh' which means 'fire'. Traditionally, it has been a unisex name, though in recent years it has become more popular for girls. Caily has not been particularly common in English-speaking countries, contributing to its uniqueness.
The name Caily appears to have had its peak popularity between the years 2000 and 2005, with a total of 64 births during these six years. However, it seems that its usage has been declining since then, as indicated by the lower number of births each year from 2006 onwards. Despite this decline, Caily remains a unique and distinct name, with a total of 183 babies given this name between 1989 and 2022.