Fair-haired or meadow of the kin
Kinly is a modern American coinage, likely a blend of the surname McKinley or the name Kinsey with the popular 'ly' suffix. It is often associated with the Gaelic 'fionn' meaning fair or white, or interpreted as a topographic name meaning 'kin's meadow'.
Less common today
Kinly isn't in the latest US Top 1000. It last peaked at #10,256 in 2010.
US births per 5-year period, 1990βpresent (SSA data).