Magnificent or high tower; lake
Maddilynn is a modern American invented name. It combines the prefix 'Maddi', derived from Madeline (referring to Magdala, meaning 'high tower'), with the popular suffix 'lynn', which is Welsh for 'lake'.
Less common today
Maddilynn isn't in the latest US Top 1000. It last peaked at #2,555 in 2018.
US births per 5-year period, 1990βpresent (SSA data).