Caylee is one of many spellings of Kaylee, a modern American name usually explained as a blend of Kay and Lee, though some connect it to the Irish word caol, "slender". The whole Kaylee family peaked in the 2000s. Caylee entered the US top 1000 in 2008 and climbed to number 264 in 2009, then fell quickly, leaving the top 1000 again and ranking 2200 in 2025 with 84 births.