Loch or lake of the pool
Locklyn is a modern Americanized spelling of the Scottish name Lachlan. It combines the Gaelic word 'loch', meaning lake or fjord, with a suffix that suggests a body of water or pool. While traditionally a masculine name in Scotland, this specific spelling is used almost exclusively for girls in the United States.
Less common today
Locklyn isn't in the latest US Top 1000. It last peaked at #3,225 in 2014.
US births per 5-year period, 1990βpresent (SSA data).