What does Susannah mean?
From Hebrew 'shoshannah', from 'shoshan' meaning 'lily' (in modern Hebrew the same word can mean 'rose'). Reaches English via Greek 'Sousanna'. The original biblical sense is 'lily'.
What does Tamar mean?
From Hebrew tamar, 'date palm.' Borne by several biblical women (Genesis 38; 2 Samuel 13). A concrete noun; the palm's associations of uprightness, grace and fruitfulness are connotation rather than part of the etymology.