Free man
A rare spelling variant of Charlotte, which is the French feminine diminutive of Charles. It ultimately derives from the Germanic name Karl, referring to a free person who was not of noble birth but held legal rights.
Less common today
Charlett isn't in the latest US Top 1000. It last peaked at #10,817 in 2017.
US births per 5-year period, 1990βpresent (SSA data).