Kaysen is an uncommon and unique first name of American origin. It is derived from the surname Kaysen, which is believed to have originated from a German patronymic form of the given name Kay, meaning "boatman" or "reed". The name Kaysen gained some recognition following its use by the author Douglas Coupland in his 1996 novel "Girlfriend in a Coma", where it was the name of one of the main characters. Today, Kaysen is considered an alternative spelling of the more common name Casey, and may be used as either a boy's or girl's name. According to the Social Security Administration data, there have been fewer than five babies named Kaysen in any given year in the United States since records began in 1879, indicating its rarity. As such, those with the first name Kaysen often stand out and are likely to be remembered for their distinctive moniker.
"Kaysen saw a steady increase in popularity from 2000 to 2014 with peaks in 2014 and 2013. However, it has since declined, with 2023 seeing only 9 births."