McKinley
A Scottish and Irish surname meaning “son of Finlay” or a related Gaelic personal name.
The #1,489 most common surname in the United States (2010 Census) — about 1 in every 12,864 Americans shares it.
Etymology
McKinley is a Gaelic patronymic surname formed with Mac, meaning “son of,” plus a personal name that appears in older records in forms like Finlay, Fionnladh, or similar Anglicized spellings. The historical sources here link McKinley with MacKinlay and other Mac- names, pointing to the same Gaelic naming pattern rather than an English occupational meaning. In practice, the surname is often treated as a variant of MacKinlay/McKinlay, which itself comes from a Gaelic personal name meaning something like “fair hero” or “fair warrior.”
History
The name is found in both Scottish and Irish contexts, and its spelling has varied widely as Gaelic names were anglicized. In North America, McKinley became especially familiar through the presidency of William McKinley, which helped fix one common spelling in public memory. Related spellings such as MacKinlay and McKinlay remain more common in some Scottish family lines.
Origin
Regions
Variant spellings
Fun fact
The surname gained extraordinary visibility in the United States because of President William McKinley, elected in 1896.
From the historical record
“TO WILLIAM . MCKINLEY PRESIDENT . OF • THE • UNITED • STATES • OF • AMERICA THIS . DICTIONARY • OF • ENGLISH • AND • WELSH • SURNAMES”
— A Dictionary of English and Welsh Surnames (alternate scan)