Dark or black-haired
Kier is an anglicized form of the Irish name Ciar, derived from the Old Irish word 'ciar' meaning 'dark' or 'black'. It was historically used to describe someone with dark hair or a dark complexion. While rare as a standalone name, it shares roots with the more common Kieran.
About 5 boys were named Kier in 2025.
US births per 5-year period, 1990–present (SSA data).
American actor known for 2001: A Space Odyssey
Prime Minister of the United Kingdom
Canadian actor known for the series Atypical
