Noble and kind
Adeleigh is a modern American elaboration of the name Adelaide or Adeline. It combines the Germanic root 'adal', meaning noble, with the popular 'leigh' suffix, which originally stems from the Old English word for a meadow or clearing.
Less common today
Adeleigh isn't in the latest US Top 1000. It last peaked at #7,587 in 2014.
US births per 5-year period, 1990βpresent (SSA data).