Declining since 2000, #1,038 for girls today.
Popularity of Kassidy since 1975
Babies named Kassidy per year in U.S. Social Security records.
Data table (by decade)
| Decade | Girls |
|---|---|
| 1970s | 44 |
| 1980s | 499 |
| 1990s | 4,690 |
| 2000s | 7,805 |
| 2010s | 6,265 |
| 2020s | 1,979 |
Meaning & origin
Kassidy entered American birth records in 1975, part of a wave of surnames turned given names and a broader taste for phonetic spellings. The name peaked in rank in the year 2000 and its trajectory has been falling since 2000. It remains most common in Mississippi, Oklahoma, and Michigan. With 1 in 6697 girls receiving the name in 2025, it sits comfortably outside the mainstream yet remains familiar. The alternate spelling sets it apart from the more traditional Cassidy, a choice some parents make to emphasize the 'K' initial or to give a name that feels both modern and grounded in Irish heritage.
Kassidy is a modern phonetic respelling of Cassidy, which derives from the Irish Gaelic surname Ó Caiside, meaning 'descendant of Caiside'. The personal name Caiside likely comes from the word 'cas', meaning 'curly-haired' or 'curly-headed'. Originally an Irish surname, Cassidy began to be used as a given name in the United States in the 20th century, with the spelling Kassidy emerging as a popular variant in the 1970s, particularly for girls.
Where Kassidy is most popular
Births per 100,000 girls by state. Press play or drag the slider to watch it move across the decades. The lightest shade means too few recorded births.
“Kassidy” around the world
Where Kassidy lands in the latest official birth statistics abroad, matched to the U.S. spelling.
France
10
babies in 2024
Sources: INSEE (France).
Nicknames & variants
Nicknames: Kass, Kassi, Kassy, Sid
Sibling names for Kassidy
Names that share Kassidy's style, for a brother or sister.
Names like Kassidy
Names whose popularity has moved with Kassidy's over the last 50 years.
