Pup or victory of the people
Kolyn is a modern spelling variant that likely draws from two distinct roots. It is often used as a creative variation of Colin, which can be a Scottish diminutive of Nicholas, meaning 'victory of the people', or derived from the Gaelic word 'cuilean' meaning 'pup' or 'cub'.
Less common today
Kolyn isn't in the latest US Top 1000. It last peaked at #4,447 in 1997.
US births per 5-year period, 1990βpresent (SSA data).