Miley is a moderately popular girls' name in England & Wales, ranking #142 in 2012 with 396 recorded births. The name reached its all-time peak in 2010 with 525 births ranking #110. In 2012, approximately 1 in every 813 girls born was named Miley. STABLE Recent data shows the name is currently stable.
Miley is a modern English name best known as a shortened form of Smiley in the case of singer and actress Miley Cyrus. Earlier examples also suggest it can sometimes work as a diminutive of Miles.
The name was not widely used before Miley Cyrus brought it into public attention. That makes it a distinctly modern celebrity-shaped name rather than one with a long traditional history.