Haily is a variant of Hailey, from an English place name meaning 'hay clearing' or 'hay meadow.'
Haily is one of several variant spellings — alongside Hailey, Haley, Haylee, and Hayleigh — of a name rooted in Old English topography. The original form was a place name, Hægleah or Hægley, composed of hæg ("hay" or possibly "hedged enclosure") and lēah ("woodland clearing" or "meadow"). It referred to grassy clearings where hay was cut or to fenced pasture land, the kind of humble, useful landscape that formed the backbone of the Anglo-Saxon agricultural world.
As an English surname it was carried by many families across Britain and into the New World. The actress and singer Haley Mills, prominent from the early 1960s onward, helped nudge the name toward fashionability, and by the 1990s Hailey had become one of the fastest-rising girls' names in the United States. The name also acquired an astronomical shimmer through its association with Halley's Comet — named for astronomer Edmond Halley (1656–1742) — though the etymological connection is coincidental rather than direct.
Nevertheless, parents drawn to the cosmos have always felt a secondary poetry in the name. The spelling Haily represents the phonetic simplicity end of the variant spectrum, stripping the name to its sound with minimal ornamentation. At the height of its popularity in the 2000s and 2010s, the name was so widely used that the cluster of spellings created a generation defined by them — Haley, Hailey, Hayley, Haily all sharing classrooms simultaneously. Today Haily reads as warm, unpretentious, and genuinely American in character: a meadow name that grew up to be a person's name.