Adalyn is a modern American spelling combining the medieval names Adelaide (Germanic adal, "noble") and the suffix -lyn (Welsh, "lake" or just euphonic). The result is a contemporary girl's name that sounds traditional but is genuinely new.
Adalyn entered the U.S. top 1000 in 2008 and has risen rapidly into the top 100. Adalynn (with two N's) is also in the top 100. The wave is part of the broader return of -lyn names (Adalyn, Brooklyn, Madelyn, Evelyn).
Adalyn reduces to nine — the number of noble warmth.