Valley or branch
Dailah is a rare name with multiple potential roots. It is often considered a variant of the Hebrew name Dalya, referring to a slender branch or grapevine, or the Arabic name Dahlia, which is associated with the flower named for botanist Anders Dahl. In some contexts, it is also linked to the Old English word for valley.
Less common today
Dailah isn't in the latest US Top 1000. It last peaked at #9,868 in 2016.
US births per 5-year period, 1990βpresent (SSA data).