From the fair field or meadow
Kinnley is a modern spelling variation of the Scottish surname McKinley. It is derived from the Gaelic elements 'ceann', meaning head or chief, and 'leighe', meaning meadow or field, often interpreted as 'fair-haired warrior's meadow'.
Less common today
Kinnley isn't in the latest US Top 1000. It last peaked at #4,222 in 2015.
US births per 5-year period, 1990βpresent (SSA data).