Keira is an anglicized form of the Irish Ciara, meaning 'dark' or 'black-haired.'
Keira is usually understood as an Anglicized form of the Irish name Ciara, from the Old Irish word ciar, meaning “dark,” “black,” or “dusky.” In early Irish naming, such descriptions often referred to hair, eyes, or complexion, and Ciara became established as a feminine form of Ciar. The name carries the long echo of early Christian Ireland through Saint Ciara, a little-documented but locally venerated saint associated with County Kilkeary.
Over time, as Irish names moved into English-speaking contexts, spellings multiplied: Kiera, Kiara, Kyra, and Keira all emerged as different attempts to render Gaelic sounds in a more familiar orthography. What gave Keira its modern image was not medieval hagiography but contemporary style. In the late 20th and early 21st centuries, Keira came to feel sleek, literary, and cinematic, helped especially by actress Keira Knightley, whose international visibility made the spelling instantly recognizable.
That modern spelling has a crispness that feels both Irish-rooted and cosmopolitan, which helps explain its appeal outside Ireland. The name’s perception has shifted accordingly. Ciara in Ireland still carries a clear native heritage, while Keira in Britain, North America, and elsewhere often suggests elegance and modern femininity with a faint Celtic romance behind it.
It belongs to a family of names that feel ancient in origin but contemporary in sound, balancing softness with sharpness. That combination has made Keira popular among parents looking for a name that is recognizably traditional in root yet stylishly global in its present form.