Mylie is a spelling variant of Miley, a name that did not exist before singer Miley Cyrus, whose childhood nickname Smiley was shortened to Miley; so it means "smiley" in the most literal sense. The spelling with a y took off together with the original when Hannah Montana aired. Mylie was almost unknown in 2000 at number 14446, entered the top 1000 in 2007, peaked at number 840 in 2008 and has since fallen back to number 2920 in 2025 with 58 births.