Kelly

Meaning & origin

Kelly transitioned from an Irish surname to a widely used given name in the United States during the 20th century. Its earliest recorded use as a first name in U.S. Social Security data was in 1907. The name reached its peak popularity in 1977, when it was among the top 20 names for girls. After that, Kelly began a long, slow decline, falling steadily since 1985. By 2025, it ranked 851st, given to approximately 1 in 5,038 baby girls that year, a sharp contrast from its heyday. Despite this, it remains a well-known name, evoking a friendly and approachable image. Its current trajectory is falling, and it shows no signs of a revival. Top states for the name include Maryland, Connecticut, and Massachusetts, suggesting a stronger presence in the Northeast. Kelly's adaptability as a unisex name, though now overwhelmingly feminine, contributed to its widespread use. While its popularity has waned, it retains a place in the lexicon of classic American names.

Kelly is an Anglicized form of the Irish surname Ó Ceallaigh, meaning 'descendant of Ceallach'. The personal name Ceallach is of uncertain origin; it may derive from the Old Irish 'cellach' meaning 'war' or 'strife', or 'ceall' meaning 'church'. Alternatively, some sources suggest 'bright-headed' from 'ceall' (bright) and 'ach' (head). The name was borne by several early Irish saints and kings. As a given name, Kelly gained popularity as a masculine name in Ireland and later became a unisex name in English-speaking countries, especially for girls since the mid-20th century.