Likely a modern combination name or variant of Kinsley.
Caisley is a modern American invention, likely created by blending the phonetic sounds of names like Casey and Paisley or as a variant of the English surname Kinsley. As a surname derivative, it would relate to 'cyne' (royal) and 'leah' (clearing), though in its current form, it is chosen primarily for its trendy sound.
Less common today
Caisley isn't in the latest US Top 1000. It last peaked at #5,389 in 2025.
US births per 5-year period, 1990βpresent (SSA data).