Haylee is a modern English spelling of Hailey, originally a surname meaning hay meadow or hay clearing.
Haylee is a modern spelling of Hayley, a name that began not as a first name but as an English surname derived from a place-name. The older form is usually explained from Old English heg, "hay," and leah, "clearing" or "meadow," so the original sense is something like "hay clearing." That pastoral origin places it among the many English names shaped by landscape.
Hayley entered broad public awareness as a given name in the twentieth century, especially after the fame of British actress Hayley Mills, and from there it spun off into a whole family of variant spellings: Haley, Hailey, Haleigh, Hayleigh, and Haylee among them. Haylee in particular belongs to the late twentieth- and early twenty-first-century taste for names that feel cheerful, youthful, and visually softened by -lee endings. The pronunciation did not change much, but the spelling made the name seem more overtly feminine and more contemporary.
Its literary associations are less classical than pop-cultural: the name feels tied to film, television, and the broader rise of bright, breezy girls' names in the 1980s, 1990s, and 2000s. Even as the many spellings competed with one another, the overall impression remained stable. Haylee suggests sunlight, friendliness, and a certain easygoing prettiness, while still carrying that old English meadowland quietly in the background.