Daily or assembly
Dailyn is a modern American invention, likely created by combining the word 'daily' with the popular 'lyn' suffix. It may also be considered a variant of the Irish name Dayla or the English name Dale, referring to a valley or an assembly.
Less common today
Dailyn isn't in the latest US Top 1000. It last peaked at #1,143 in 2020.
US births per 5-year period, 1990βpresent (SSA data).