What does Joanna mean?
From Greek Ioanna, the feminine of Ioannes (John), ultimately from Hebrew 'Yochanan' meaning 'Yahweh is gracious.' A New Testament name and a John-root grace name.
What does Delilah mean?
Meaning uncertain. Usually traced to the root dalal, 'to hang low, be low, languish, weaken,' giving the common glosses 'delicate' or '(she who) weakened' — and the Samson narrative plays on her bringing him low (Judges 16). Competing proposals include 'temptress' (from an Arabic root) and a shortened theophoric tied to Ishtar; some lexicons simply mark it 'unknown.' Treat as disputed.