Kaylee is a variant spelling of Kayley. The name Kayley is of recent origin and uncertain derivation. It is possibly a form of the Hebrew name Kayla. It may have also been derived from the Irish Gaelic name O Caollaidhe meaning descendant of Gaolladhe, a personal name drawn from the element caol, meaning slender.he meaning of Kaylee is modern invented name. It is also of Irish origin, where its meaning is descendant of Caolladhe, slender and Hebrew origin, where its meaning is crown of laurels.