Keyly is likely related to Kelly or Keeley, names from Irish surnames associated with strife or beauty.
Keyly is a modern American phonetic variant of Keely, a name with Irish Gaelic origins that deserves more attention than it typically receives. The traditional Irish form, Cadhla, was pronounced roughly as 'KY-la' or 'KEY-la' and carried the meaning 'beautiful,' 'graceful,' or 'one who is admired.' It appears in medieval Irish manuscripts and bardic poetry as an epithet for women of exceptional loveliness — not merely physical beauty, but a grace of bearing and manner that commanded respect.
As Irish names traveled with immigrant communities to the United States, Australia, and the United Kingdom, Cadhla was anglicized into Keely, Keelie, and Keeley — spellings that preserved the sound while making the name accessible to non-Irish speakers. The name saw moderate popularity through the mid-twentieth century, carried by figures like jazz flutist Keely Smith, whose smooth, sophisticated style made her a household name in the 1950s and 1960s. Her association brought the name a certain cool, musical glamour.
Keyly represents the next evolution: a spelling that emphasizes the name's contemporary sound and sets it apart visually from its predecessors. The 'K-e-y' opening evokes the word 'key,' adding an unintended connotation of unlocking or access. This version of the name is distinctly American in its spelling confidence, characteristic of a generation of parents who treat the written form of a name as an extension of its meaning. It retains all the Gaelic grace of its ancestor while announcing itself as something wholly new.