Mckinnley is a surname-style variant of McKinley, from Gaelic roots meaning "son of the fair warrior" or similar.
Mckinnley is a variant spelling of McKinley, a name with deep Gaelic roots: it derives from the Irish and Scottish Mac Fionnlaigh, meaning 'son of Finlay,' where Finlay itself combines 'fionn' (fair, white, bright) and 'laoch' (hero or warrior). The name entered the English-speaking world as a clan surname, carried by families from the Scottish Highlands and Ulster Scots who migrated to Ireland and later to the Americas, where it became firmly entrenched in the cultural landscape. The name's most prominent historical bearer is William McKinley, the 25th President of the United States, who served from 1897 until his assassination in 1901.
His legacy gave the name considerable resonance in American political memory. More literally, Denali — the great mountain in Alaska — was officially named Mount McKinley in his honor from 1917 until 2015, making McKinley one of the few names attached to North America's highest peak for nearly a century. That geographic grandeur lends the name an almost elemental scale.
As a given name — particularly in the spelling Mckinnley — it reflects the contemporary trend of reclaiming strong Scots-Irish surnames for first-name use, especially for girls. The name carries both presidential gravitas and the rugged, open-landscape imagery of the mountain, while the slightly softened spelling gives it a more personal, individualized character. It sits comfortably alongside surname-names like Kennedy, Reagan, and Mackenzie as a choice that blends historical substance with modern sensibility.