Bitter or tower, combined with lake
A modern American compound name blending Maddie, a diminutive of Madeline or Madison, with the popular suffix -lynn. Madeline stems from Magdala, meaning 'tower' in Hebrew, while Lynn is derived from the Welsh word for 'lake'.
Less common today
Maddielynn isn't in the latest US Top 1000. It last peaked at #10,757 in 2016.
US births per 5-year period, 1990βpresent (SSA data).