Fair, white, or clear
Finnleigh is a modern feminine elaboration of the Irish name Finn, combined with the English suffix -leigh. It derives from the Old Irish name Fionn, which refers to someone with fair hair or a bright complexion.
Less common today
Finnleigh isn't in the latest US Top 1000. It last peaked at #5,038 in 2017.
US births per 5-year period, 1990βpresent (SSA data).