What does Shira mean?
Modern Hebrew shira, 'song, singing, poetry' (root sh-y-r). A popular contemporary given name; a concrete noun with no theophoric element.
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.