Kassidie is of American origin, derived from the English surname 'Cassidy'. It is believed to have originated from an Irish Gaelic sept name 'Ó Casaide', which means 'clever' or 'curly-headed'. The name gained popularity in the United States during the 20th century, likely due to its association with celebrities like Jackie Cassidy, a famous actor known for his roles in films such as 'The Commitments' and 'Waking Ned Devine'. Kassidie is not a traditional name with widespread historical use, but rather a modern creation that has found favor among parents seeking unique names for their children.
"The name Kassidie saw a significant increase in popularity from 1998 to 2001, with the highest number of births occurring in 2001 (22). However, it has since fluctuated, with a steady decline observed after 2006."