What does Rosalind mean?
Disputed etymology. Originally Germanic, from 'hros' (horse) + 'lind' (soft, tender), i.e. roughly 'gentle horse'. In Romance-speaking areas it was reinterpreted by folk etymology as Latin/Spanish 'rosa linda' meaning 'beautiful rose'. The floral meaning is the popular later reading, not the original.
What does Matilda mean?
From the Germanic elements 'maht' (might, strength) and 'hild' (battle), giving the sense 'mighty in battle'. Popularized by the 11th-century Queen Matilda, wife of William the Conqueror.